N-CSR

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM N-CSR

CERTIFIED SHAREHOLDER REPORT OF REGISTERED MANAGEMENT INVESTMENT COMPANIES

Investment Company Act file number 811-05812

Legg Mason Partners Premium Money Market Trust
(Exact name of registrant as specified in charter)

55 Water Street, New York, NY 10041
(Address of principal executive offices) (Zip code)

Robert I. Frenkel, Esq.
Legg Mason & Co., LLC
300 First Stamford Place,4^th Fl.
Stamford, CT 06902
(Name and address of agent for service)

Registrant's telephone number, including area code: (800) 451-2010

Date of fiscal year end: August 31
Date of reporting period: August 31, 2008

ITEM 1.     REPORT TO STOCKHOLDERS.

The Annual Report to Stockholders is filed herewith.

ANNUAL REPORT / AUGUST 31, 2008
CitiSM Premium U.S. Treasury Reserves
Managed by WESTERN ASSET
INVESTMENT PRODUCTS: NOT FDIC INSURED • NO BANK GUARANTEE • MAY LOSE VALUE

Fund objective
The Fund seeks to provide its shareholders with liquidity and as high a level of current income from U.S. government obligations as is consistent with the preservation of capital.
What’s inside
Letter from the chairman	I
Fund overview	1
Portfolio at a glance – U.S. Treasury Reserves Portfolio	4
Fund expenses	5
Fund performance	7
Historical performance	8
CitiSM Premium U.S. Treasury Reserves
Statement of assets and liabilities	9
Statement of operations	10
Statements of changes in net assets	11
Financial highlights	12
Notes to financial statements	13
Report of independent registered public accounting firm	20
Additional information	21
Important tax information	28
U.S. Treasury Reserves Portfolio
Schedule of investments	29
Statement of assets and liabilities	30
Statement of operations	31
Statements of changes in net assets	32
Financial highlights	33
Notes to financial statements	34
Report of independent registered public accounting firm	39
Additional information	40
Legg Mason Partners Fund Advisor, LLC (“LMPFA”) is the Fund’s and the Portfolio’s investment manager and Western Asset Management Company (“Western Asset”) is the Fund’s and the Portfolio’s subadviser. LMPFA and Western Asset are wholly-owned subsidiaries of Legg Mason, Inc. (“Legg Mason”).
“Citi” is a service mark of Citigroup, licensed for use by Legg Mason as the name of funds. Legg Mason and its affiliates, as well as the Fund’s investment manager, are not affiliated with Citigroup. Investments in the Fund referenced herein are not bank deposits or obligations of Citibank.

Letter from the chairman
R. Jay Gerken, CFA Chairman, President and Chief Executive Officer
Dear Shareholder,
Economic growth in the U.S. was mixed during the 12-month reporting period ended August 31, 2008. Looking back, third quarter 2007 U.S. gross domestic product (“GDP”)i growth was a very strong 4.8%. However, continued weakness in the housing market, an ongoing credit crunch and soaring oil and food prices then took their toll on the economy, as fourth quarter 2007 GDP declined 0.2%. The economy then expanded 0.9% during the first quarter of 2008, and second quarter 2008 GDP growth was 2.8%. In recent months, the economy was supported by strong exports and consumer spending, the latter of which was aided by the government’s tax rebate checks.
While the economy may not fall into a recession, it is a moot point for many Americans, as the job market continues to weaken and energy prices remain elevated. In terms of the employment picture, the U.S. Department of Labor reported that payroll employment declined in each of the first eight months of 2008, and the unemployment rate rose to 6.1% in August, its highest level since September 2003. After oil reached a record $147 a barrel on July 11, 2008, it fell to $115 as of August 31, 2008. However, it continues to be well above the price of $74 per barrel as of August 31, 2007.
Ongoing issues related to the housing and subprime mortgage markets and seizing credit markets prompted the Federal Reserve Board (“Fed”)ii to take aggressive and, in some cases, unprecedented actions. Beginning in September 2007, the Fed reduced the federal funds rateiii from 5.25% to 4.75%. This marked the first such reduction since June 2003. The Fed then reduced the federal funds rate on six additional occasions through April 2008, bringing the federal funds rate to 2.00%. The Fed then shifted gears in the face of mounting inflationary prices and a weakening U.S. dollar. At its meetings in June, August and September (after the reporting period ended), the Fed held rates steady. In conjunction with its September meeting, the Fed stated: “Strains in financial markets have increased significantly and labor markets have weakened further. Economic growth appears to have slowed recently, partly reflecting a softening of household spending. Tight credit conditions, the ongoing housing contraction, and some slowing in export growth are likely to weigh on economic growth over the next few quarters.” Then, on October 8, 2008, in a global coordination effort with six central

Citi^SM Premium U.S. Treasury Reserves | I

Letter from the chairman continued

banks around the world, interest rates were cut in an attempt to reduce the strains in the global financial markets. At that time, the Fed lowered the federal funds rate from 2.00% to 1.50%.

In addition to the interest rate cuts, the Fed took several actions to improve liquidity in the credit markets. In March 2008, the Fed established a new lending program allowing certain brokerage firms, known as primary dealers, to also borrow from its discount window. The Fed also increased the maximum term for discount window loans from 30 to 90 days. Also in March, the Fed played a major role in facilitating the purchase of Bear Stearns by JPMorgan Chase. Then, after the close of the reporting period, in mid-September, it announced an $85 billion rescue plan for ailing AIG and pumped $70 billion into the financial system as Lehman Brothers’ bankruptcy and mounting troubles at other financial firms roiled the markets. The U.S. Department of the Treasury also took an active role in attempting to stabilize the financial system, as it orchestrated the government’s takeover of mortgage giants Fannie Mae and Freddie Mac in September. In addition, the Treasury proposed a $700 billion rescue plan to help financial institutions reduce their exposure to troubled mortgage-related securities. After the House of Representatives initially rejected the plan on September 29, 2008, a revamped version was approved by Congress and, on October 3, 2008, signed into law by the President of the United States.

During the 12-month reporting period ended August 31, 2008, both short-and long-term Treasury yields experienced periods of extreme volatility. Investors were initially focused on the subprime segment of the mortgage-backed market. These concerns broadened, however, to include a wide range of financial institutions and markets. As a result, other fixed-income instruments also experienced increased price volatility. This turmoil triggered several “flights to quality,” causing Treasury yields to move lower (and their prices higher), while riskier segments of the market saw their yields move higher (and their prices lower). Treasury yields then rose in April, May and early June 2008, as oil prices hit record levels. However, an additional credit crunch in mid-June resulted in another flight to quality, with Treasury yields again moving lower. Overall, during the 12 months ended August 31, 2008, two-year Treasury yields fell from 4.15% to 2.36%. Over the same time frame, 10-year Treasury yields moved from 4.54% to 3.83%.

During the reporting period, the yields available from money market instruments fluctuated and ultimately moved lower given the Fed’s numerous rate cuts. The current market challenges have not affected the Fund’s $1.00 share price. Additionally, we believe that the current situation should not affect the Fund’s $1.00 share price, going forward. Over time, we also believe that the Fund’s returns should remain competitive.

II | Citi^SM Premium U.S. Treasury Reserves

A special note regarding recent market volatility
In recent weeks, we have experienced a series of events that have impacted the financial markets and created concerns among both novice and seasoned investors alike. In particular, we have witnessed the failure and consolidation of several storied financial institutions, periods of heightened market volatility, and aggressive actions by the U.S. federal government to steady the financial markets and restore investor confidence. While we hope that the worst is over in terms of the issues surrounding the credit and housing crises, it is likely that the fallout will continue to impact the financial markets and the U.S. economy during the remainder of the year and, perhaps, into 2009 as well.
Like all asset management firms, Legg Mason has not been immune to these difficult and, in some ways, unprecedented times. However, today’s challenges have only strengthened our resolve to do everything we can to help you reach your financial goals. Now, as always, we remain steadfast in our commitment to provide you with extraordinary service and a full spectrum of investment choices. And rest assured, we will continue to work hard to ensure that our investment managers do everything in their power to deliver strong long-term results.
The Fund participates in the U.S. Treasury Department’s Temporary Guarantee Program for money market funds. Shareholders in the Fund as of the close of business on September 19, 2008 will have a temporary U.S. Treasury guarantee on balances up to the amount held in the Fund on that date. Legg Mason believes this program will provide support to our shareholders as we manage through this market environment.
We also remain committed to supplementing the support you receive from your financial advisor. One way we accomplish this is through our enhanced website, www.leggmason.com/individualinvestors. Here you can gain immediate access to many special features to help guide you through difficult times, including:
•	Fund prices and performance,
•	Market insights and commentaries from our portfolio managers, and
•	A host of educational resources.
During periods of market unrest, it is especially important to work closely with your financial advisor and remember that reaching one’s investment goals unfolds over time and through multiple market cycles. Time and again, history has shown that, over the long run, the markets have eventually recovered and grown.

Citi^SM Premium U.S. Treasury Reserves | III

Letter from the chairman continued
Information about your fund
As you may be aware, several issues in the mutual fund industry have come under the scrutiny of federal and state regulators. Affiliates of the Fund’s manager have, in recent years, received requests for information from various government regulators regarding market timing, late trading, fees, and other mutual fund issues in connection with various investigations. The regulators appear to be examining, among other things, the Fund’s response to market timing and shareholder exchange activity, including compliance with prospectus disclosure related to these subjects. The Fund is not in a position to predict the outcome of these requests and investigations.
Please read on for a more detailed look at prevailing economic and market conditions during the Fund’s reporting period and to learn how those conditions have affected Fund performance.
Important information with regard to recent regulatory developments that may affect the Fund is contained in the Notes to Financial Statements included in this report.
As always, thank you for your confidence in our stewardship of your assets. We look forward to helping you meet your financial goals.
Sincerely,
R. Jay Gerken, CFA
Chairman, President and Chief Executive Officer
October 8, 2008
i	Gross domestic product (“GDP”) is the market value of all final goods and services produced within a country in a given period of time.
ii	The Federal Reserve Board (“Fed”) is responsible for the formulation of policies designed to promote economic growth, full employment, stable prices, and a sustainable pattern of international trade and payments.
iii	The federal funds rate is the rate charged by one depository institution on an overnight sale of immediately available funds (balances at the Federal Reserve) to another depository institution; the rate may vary from depository institution to depository institution and from day to day.

IV |  Citi^SM Premium U.S. Treasury Reserves

Fund overview

Q. What is the Fund’s investment strategy?

A. The Fund seeks to provide its shareholders with liquidity and as high a level of current income from U.S. government obligations as is consistent with the preservation of capital. The Fund invests in securities through an underlying mutual fund, U.S. Treasury Reserves Portfolio (the “Portfolio”), which has the same investment objective and strategies as the Fund. Under normal circumstances, the Portfolio invests all of its assets in direct obligations of the U.S. Treasury, including U.S. Treasury bills, notes and bonds. The Portfolio will not enter into repurchase agreements or purchase securities issued by U.S. government agencies and instrumentalities that are backed by the full faith and credit of the U.S. government except in unusual circumstances when, in the judgment of Western Asset Management Company (“Western Asset”), the Fund’s and the Portfolio’s subadviser, direct U.S. Treasury obligations are not available.

Western Asset utilizes a fixed-income team approach, with decisions derived from interaction among various investment management sector specialists. The sector teams are comprised of Western Asset’s senior portfolio managers, research analysts and an in-house economist. Under this team approach, management of client fixed-income portfolios will reflect a consensus of interdisciplinary views within the Western Asset organization.

Q. What were the overall market conditions during the Fund’s reporting period?

A. During the fiscal year, the U.S. bond market experienced periods of increased volatility. Changing perceptions regarding the economy, inflation and future Federal Reserve Board (“Fed”)ⁱ monetary policy caused bond prices to fluctuate. Two- and 10-year Treasury yields began the reporting period at 4.15% and 4.54%, respectively. Treasury yields then moved lower — and their prices moved higher — as concerns regarding the subprime mortgage market and a severe credit crunch triggered a massive “flight to quality.” Investors were drawn to the relative safety of Treasuries, while increased risk aversion caused other segments of the bond market to falter.

As conditions in the credit market worsened in the summer of 2007, central banks around the world took action by injecting approximately $500 billion of liquidity into the financial system. Additionally, the Fed began lowering the federal funds rateⁱⁱ in September 2007. While this initially helped ease the credit crunch, continued subprime mortgage write-offs and weak economic data triggered additional flights to quality in November 2007 and the first quarter of 2008.

Treasury yields then moved higher in April, May and early June, as inflationary pressures increased. Over this period, riskier fixed-income asset classes, such as high-yield bonds and emerging market debt rallied. However, the credit crunch

Citi^SM Premium U.S. Treasury Reserves 2008 Annual Report | 1

Fund overview continued

resumed in mid-June, resulting in another flight to quality. This caused Treasury yields to move lower during much of the remainder of the reporting period.

At the end of the fiscal year, two- and 10-year Treasury yields were 2.36% and 3.83%, respectively. While the Fed attempted to stimulate growth by cutting short-term interest rates from 5.25% to 2.00% from September 2007 through April 2008, it has held rates steady at its most recent meetings.

Q. How did we respond to these changing market conditions?

A. Over the reporting period, as economic activity weakened, labor markets softened and financial markets remained strained, the Fed lowered the federal funds rate a cumulative 325 basis points. In response, we maintained a long average maturity in order to lock in higher yields. At various times, we tactically traded short maturity Treasury bills as market concerns intensified.

Performance review

As of August 31, 2008, the seven-day current yield for Citi^SM Premium U.S. Treasury Reserves was 1.41% and its seven-day effective yield, which reflects compounding, was 1.42%.¹

Current expense reimbursements and/or fee waivers are voluntary and may be reduced or terminated at any time. Absent current expense reimbursements and/or fee waivers, the seven-day current yield would have been 1.33% and the seven-day effective yield would have been 1.34%.

CITISM PREMIUM U.S. TREASURY RESERVES Yields as of August 31, 2008 (unaudited)
Seven-day current yield1	1.41%
Seven-day effective yield1	1.42%

The performance shown represents past performance. Past performance is no guarantee of future results and current performance may be higher or lower than the performance shown above. Yields will fluctuate. To obtain performance data current to the most recent month-end, please visit our website at www.leggmason.com/individualinvestors.

Current expense reimbursements and/or fee waivers are voluntary and may be reduced or terminated at any time. Absent current expense reimbursements and/or fee waivers, the seven-day current yield would have been 1.33% and the seven-day effective yield would have been 1.34%.

An investment in the Fund is neither insured nor guaranteed by the Federal Deposit Insurance Corporation (“FDIC”) or any other government agency. Although the Fund seeks to preserve the value of your investment at $1.00 per share, it is possible to lose money by investing in the Fund.

¹ The seven-day current yield reflects the amount of income generated by the investment during that seven-day period and assumes that the income is generated each week over a 365-day period. The yield is shown as a percentage of the investment. The seven-day effective yield is calculated similarly to the seven-day current yield but, when annualized, the income earned by an investment in the Fund is assumed to be reinvested. The effective yield typically will be slightly higher than the current yield because of the compounding effect of the assumed reinvestment.

2 |  Citi^SM Premium U.S. Treasury Reserves 2008 Annual Report

Q. What were the most significant factors affecting Fund performance?

A. Throughout most of the period, and particularly in the second half of the reporting period, our long average maturity proved beneficial to performance as Treasury yields moved lower on concerns over a slowing economy and a continued flight to quality from the ongoing financial crisis.

Q. Were there any significant changes to the Fund during the reporting period?

A. There were no significant changes to the Fund during the reporting period.

Thank you for your investment in Citi^SM Premium U.S. Treasury Reserves. As always, we appreciate that you have chosen us to manage your assets and we remain focused on achieving the Fund’s investment goals.

Sincerely,

Western Asset Management Company

September 16, 2008

The information provided is not intended to be a forecast of future events, a guarantee of future results or investment advice. Views expressed may differ from those of the firm as a whole.

RISKS: An investment in a money market fund is neither insured nor guaranteed by the FDIC or any other government agency. Although the Fund seeks to preserve the value of your investment at one dollar per share, it is possible to lose money by investing in the Fund. Please see the Fund’s prospectus for more information on these and other risks.

i	The Federal Reserve Board (“Fed”) is responsible for the formulation of policies designed to promote economic growth, full employment, stable prices, and a sustainable pattern of international trade and payments.
ii	The federal funds rate is the rate charged by one depository institution on an overnight sale of immediately available funds (balances at the Federal Reserve) to another depository institution; the rate may vary from depository institution to depository institution and from day to day.

Citi^SM Premium U.S. Treasury Reserves 2008 Annual Report | 3

Portfolio at a glance (unaudited)

U.S. Treasury Reserves Portfolio

The Fund invests all of its investable asset in U.S. Treasury Reserves Portfolio, the investment breakdown of which is shown below.

INVESTMENT BREAKDOWN (%) As a percent of total investments — August 31, 2008

4 |  Citi^SM Premium U.S. Treasury Reserves 2008 Annual Report

Fund expenses (unaudited)

Example

As a shareholder of the Fund, you may incur two types of costs: (1) transaction costs and (2) ongoing costs, including management fees, distributions and/or service (12b-1) fees and other Fund expenses. This example is intended to help you understand your ongoing costs (in dollars) of investing in the Fund and to compare these costs with the ongoing costs of investing in other mutual funds.

This example is based on an investment of $1,000 invested on March 1, 2008 and held for the six months ended August 31, 2008.

Actual expenses

The table below titled “Based on Actual Total Return” provides information about actual account values and actual expenses. You may use the information provided in this table, together with the amount you invested, to estimate the expenses that you paid over the period. To estimate the expenses you paid on your account, divide your ending account value by $1,000 (for example, an $8,600 ending account value divided by $1,000 = 8.6), then multiply the result by the number under the heading entitled “Expenses Paid During the Period”.

BASED ON ACTUAL TOTAL RETURN1
	ACTUAL TOTAL RETURN2	BEGINNING ACCOUNT VALUE	ENDING ACCOUNT VALUE	ANNUALIZED EXPENSE RATIO	EXPENSES PAID DURING THE PERIOD3
CitiSM Premium
U.S. Treasury Reserves	0.66%	$1,000.00	$1,006.60	0.45%	$2.27

1	For the six months ended August 31, 2008.
2	Assumes reinvestment of all distributions at net asset value. Total return is not annualized, as it may not be representative of the total return for the year. Performance figures may reflect fee waivers and/or expense reimbursements. In the absence of fee waivers and/or expense reimbursements, the total return would have been lower. Past performance is no guarantee of future results.
3	Expenses (net of fee waivers and/or expense reimbursements) are equal to the Fund’s annualized expense ratio multiplied by the average account value over the period, multiplied by the number of days in the most recent fiscal half-year, then divided by 366.

Citi^SM Premium U.S. Treasury Reserves 2008 Annual Report | 5

Fund expenses (unaudited) continued

Hypothetical Example for Comparison Purposes

The table below titled “Based on Hypothetical Total Return” provides information about hypothetical account values and hypothetical expenses based on the actual expense ratio and an assumed rate of return of 5.00% per year before expenses, which is not the Fund’s actual return. The hypothetical account values and expenses may not be used to estimate the actual ending account balance or expenses you paid for the period. You may use the information provided in this table to compare the ongoing costs of investing in the Fund and other funds. To do so, compare the 5.00% hypothetical example relating to the Fund with the 5.00% hypothetical examples that appear in the shareholder reports of the other funds.

Please note that the expenses shown in the table below are meant to highlight your ongoing costs only and do not reflect any transactional costs. Therefore, the table is useful in comparing ongoing costs only, and will not help you determine the relative total costs of owning different funds. In addition, if these transaction costs were included, your costs would have been higher.

BASED ON HYPOTHETICAL TOTAL RETURN¹

	HYPOTHETICAL ANNUALIZED TOTAL RETURN		BEGINNING ACCOUNT VALUE		ENDING ACCOUNT VALUE		ANNUALIZED EXPENSE RATIO		EXPENSES PAID DURING THE PERIOD2
CitiSM Premium U.S. Treasury Reserves		5.00%		$1,000.00		$1,022.87		0.45%		$2.29

1	For the six months ended August 31, 2008.
2	Expenses (net of fee waivers and/or expense reimbursements) are equal to the Fund’s annualized expense ratio, multiplied by the average account value over the period, multiplied by the number of days in the most recent fiscal half-year then divided by 366.

6 | Citi^SM Premium U.S. Treasury Reserves 2008 Annual Report

Fund performance (unaudited)

TOTAL RETURNS

ALL PERIODS ENDED AUGUST 31, 2008	ONE YEAR			FIVE YEARS*			TEN YEARS*
CitiSM Premium U.S. Treasury Reserves		2.23	%		2.62	%		2.99	%
iMoneyNet, Inc. 100% U.S. Treasury Rated Money Market Funds Average		2.09			2.46			2.86
*  Average Annual Total Return
7-DAY YIELDS1
Current		1.41	%
Effective		1.42

1	The seven-day current yield reflects the amount of income generated by the investment during that seven-day period and assumes that the income is generated each week over a 365-day period. The yield is shown as a percentage of the investment.
	The seven-day effective yield is calculated similarly to the seven-day current yield but, when annualized, the income earned by an investment in the Fund is assumed to be reinvested. The effective yield typically will be slightly higher than the current yield because of the compounding effect of the assumed reinvestment.
Note:	A money market fund’s yield more closely reflects the current earnings of the fund than does the total return.
	Although money market funds seek to maintain the value of your investment at $1.00 per share, it is possible to lose money by investing in the Fund. Mutual fund shares are not guaranteed or insured by the Federal Deposit Insurance Corporation or any other government agency. Yields and total returns will fluctuate and past performance is no guarantee of future results. Total return figures include reinvestment of all distributions, including returns of capital, if any. Returns and yields may reflect certain fee waivers and/or expense reimbursements. In the absence of fee waivers and/or expense reimbursements, the Fund’s returns and yields would have been lower.

Citi^SM Premium U.S. Treasury Reserves 2008 Annual Report | 7

Historical performance (unaudited)

COMPARISON OF 7-DAY YIELDS FOR CITI^SM PREMIUM U.S. TREASURY RESERVES VS.
iMONEYNET, INC. 100% U.S. TREASURY RATED MONEY MARKET FUNDS AVERAGE —
September 2007 - August 2008

As illustrated, Citi^SM Premium U.S. Treasury Reserves generally provided an annualized seven-day yield greater than that of the iMoneyNet, Inc. 100% U.S. Treasury Rated Money Market Funds Average, as published in iMoneyNet, Inc. Money Fund Report™, for the one-year period.

Yields will fluctuate and past performance is no guarantee of future results. Fund yields may reflect certain fee waivers and/or expense reimbursements. In the absence of fee waivers and/or expense reimbursements, the Fund’s yield would have been lower.

* Source iMoneyNet, Inc.

8 | Citi^SM Premium U.S. Treasury Reserves 2008 Annual Report

Statement of assets and liabilities
August 31, 2008

ASSETS:
Investment in U.S. Treasury Reserves Portfolio, at value	$	209,669,159
Prepaid expenses		21,075
Total Assets		209,690,234
LIABILITIES:
Distributions payable		284,516
Investment management fee payable		40,290
Distribution fees payable		26,665
Trustees’ fees payable		1,240
Payable for Fund shares repurchased		86
Accrued expenses		174,916
Total Liabilities		527,713
TOTAL NET ASSETS	$	209,162,521
NET ASSETS:
Par value (Note 3)	$	2,092
Paid-in capital in excess of par value		209,151,109
Undistributed net investment income		4,747
Accumulated net realized gain on investments		4,573
TOTAL NET ASSETS	$	209,162,521
Shares Outstanding		209,153,201
Net Asset Value	$	1.00

See Notes to Financial Statements.

Citi^SM Premium U.S. Treasury Reserves 2008 Annual Report | 9

Statement of operations
For the Year Ended August 31, 2008

INVESTMENT INCOME:
Income from U.S. Treasury Reserves Portfolio	$	7,341,004
Allocated net expenses from U.S. Treasury Reserves Portfolio		(294,578	)
Total Investment Income		7,046,426
EXPENSES:
Investment management fee (Note 2)		735,403
Distribution fees (Note 2)		294,161
Legal fees		82,661
Shareholder reports		54,970
Registration fees		25,390
Audit and tax		17,016
Transfer agent fees		12,722
Insurance		5,056
Trustees’ fees		5,011
Miscellaneous expenses		10,969
Total Expenses		1,243,359
Less: Fee waivers and/or expense reimbursements (Note 2)		(214,174	)
Net Expenses		1,029,185
NET INVESTMENT INCOME		6,017,241
NET REALIZED GAIN ON INVESTMENTS FROM U.S. TREASURY RESERVES PORTFOLIO		5,523
INCREASE IN NET ASSETS FROM OPERATIONS	$	6,022,764

See Notes to Financial Statements.

10 | Citi^SM Premium U.S. Treasury Reserves 2008 Annual Report

Statements of changes in net assets

FOR THE YEAR ENDED AUGUST 31,	2008			2007
OPERATIONS:
Net investment income	$	6,017,241		$	8,881,268
Net realized gain		5,523			5,677
Increase in Net Assets From Operations		6,022,764			8,886,945
DISTRIBUTIONS TO SHAREHOLDERS FROM (NOTE 1):
Net investment income		(6,017,241	)		(8,876,899	)
Net realized gains		(950	)		(4,747	)
Decrease in Net Assets From Distributions to Shareholders		(6,018,191	)		(8,881,646	)
FUND SHARE TRANSACTIONS (NOTE 3):
Net proceeds from sale of shares		820,845,361			348,195,295
Reinvestment of distributions		1,331,611			3,130,889
Cost of shares repurchased		(816,992,545	)		(363,064,518	)
Increase (Decrease) in Net Assets From Fund Share Transactions		5,184,427			(11,738,334	)
INCREASE (DECREASE) IN NET ASSETS		5,189,000			(11,733,035	)
NET ASSETS:
Beginning of year		203,973,521			215,706,556
End of year*	$	209,162,521		$	203,973,521
* Includes undistributed net investment income of:	$	4,747		$	4,747

See Notes to Financial Statements.

Citi^SM Premium U.S. Treasury Reserves 2008 Annual Report | 11

Financial highlights

FOR A SHARE OF BENEFICIAL INTEREST OUTSTANDING THROUGHOUT EACH YEAR ENDED AUGUST 31:
	2008			2007			2006			2005			2004
NET ASSET VALUE, BEGINNING OF YEAR	$	1.000		$	1.000		$	1.000		$	1.000		$	1.000
INCOME FROM OPERATIONS:
Net investment income		0.022			0.045			0.038			0.019			0.006
Net realized gain1		0.000			0.000			0.000			0.000			0.000
Total income from operations		0.022			0.045			0.038			0.019			0.006
LESS DISTRIBUTIONS FROM:
Net investment income		(0.022	)		(0.045	)		(0.038	)		(0.019	)		(0.006	)
Net realized gains1		(0.000	)		(0.000	)		(0.000	)		(0.000	)		(0.000	)
Total distributions		(0.022	)		(0.045	)		(0.038	)		(0.019	)		(0.006	)
NET ASSET VALUE, END OF YEAR	$	1.000		$	1.000		$	1.000		$	1.000		$	1.000
Total return2		2.23	%		4.60	%		3.85	%		1.90	%		0.57	%
NET ASSETS, END OF YEAR (000s)	$	209,163		$	203,974		$	215,707		$	384,003		$	390,847
RATIOS TO AVERAGE NET ASSETS:
Gross expenses3		0.53	%		0.55	%4		0.53	%		0.53	%		0.53	%
Net expenses3,5,6		0.45			0.45	4		0.45			0.45			0.45
Net investment income		2.05			4.50			3.70			1.83			0.56

1	Amount represents less than $0.0005 per share.
2	Performance figures may reflect fee waivers and/or expense reimbursements. In the absence of fee waivers and/or expense reimbursements, the total return would have been lower. Past performance is no guarantee of future results.
3	Includes the Fund’s share of U.S. Treasury Reserves Portfolio’s allocated expenses.
4	Included in the expense ratios are certain non-recurring restructuring (and reorganization, if applicable) fees that were incurred by the Fund during the period. Without these fees, the gross and net expense ratios would have been 0.54% and 0.44%, respectively.
5	Reflects fee waivers and/or expense reimbursements.
6	As a result of a voluntary expense limitation, the ratio of expenses, other than interest, brokerage, taxes and extraordinary expenses, to average net assets of shares will not exceed 0.45%.

See Notes to Financial Statements.

12 | Citi^SM Premium U.S. Treasury Reserves 2008 Annual Report

Notes to financial statements

1. Organization and significant accounting policies

Citi^SM Premium U.S. Treasury Reserves (the “Fund”) is a separate diversified investment series of Legg Mason Partners Premium Money Market Trust (the “Trust”). The Trust, a Maryland business trust, is registered under the Investment Company Act of 1940, as amended (the “1940 Act”), as an open-end management investment company. The Fund invests all of its investable assets in U.S. Treasury Reserves Portfolio (the “Portfolio”), a separate investment series of Master Portfolio Trust that has the same objective as the Fund.

The financial statements of the Portfolio, including the schedule of investments, are contained elsewhere in this report and should be read in conjunction with the Fund’s financial statements.

The following are significant accounting policies consistently followed by the Fund and are in conformity with U.S. generally accepted accounting principles (“GAAP”). Estimates and assumptions are required to be made regarding assets, liabilities and changes in net assets resulting from operations when financial statements are prepared. Changes in the economic environment, financial markets and any other parameters used in determining these estimates could cause actual results to differ.

(a) Investment valuation. The Fund records its investment in the Portfolio at value. The value of such investment in the Portfolio reflects the Fund’s proportionate interest (1.5% at August 31, 2008) in the net assets of the Portfolio. Valuation of securities held by the Portfolio is discussed in Note 1(a) of the Portfolio’s Notes to Financial Statements, which are included elsewhere in this report.

(b) Investment income. The Fund earns income, net of Portfolio expense, daily based on its investment in the Portfolio.

(c) Expenses. The Fund bears all costs of its operations other than expenses specifically assumed by the Manager. Expenses incurred by the Trust with respect to any two or more funds in the series are allocated in proportion to the average net assets of each fund, except when allocations of direct expenses to each fund can otherwise be made fairly. Expenses directly attributable to a fund are charged to that fund. The Fund’s share of the Portfolio’s expenses is charged against and reduces the amount of the Fund’s investment in the Portfolio.

(d) Method of allocation. All the net investment income and net realized and unrealized gains and losses of the Portfolio are allocated pro rata, based on respective ownership interests, among the Fund and other investors in the Portfolio at the time of such determination.

(e) Distributions to shareholders. Distributions from net investment income on the shares of the Fund are declared as of 2:00 p.m. Eastern Time, each business day to shareholders of record, and are paid monthly. Distributions of net realized gains, if any, are declared at least annually. Distributions are recorded on the ex-

Citi^SM Premium U.S. Treasury Reserves 2008 Annual Report | 13

Notes to financial statements continued

dividend date and are determined in accordance with income tax regulations, which may differ from GAAP.

(f) Federal and other taxes. It is the Fund’s policy to comply with the federal income and excise tax requirements of the Internal Revenue Code of 1986, as amended, applicable to regulated investment companies. Accordingly, the Fund intends to distribute substantially all of its taxable income and net realized gains, if any, to shareholders each year. Therefore, no federal income tax provision is required in the Fund’s financial statements.

Management has analyzed the Fund’s tax positions taken on federal income tax returns for all open tax years and has concluded that as of August 31, 2008, no provision for income tax would be required in the Fund’s financial statements. The Fund’s federal and state income and federal excise tax returns for tax years for which the applicable statutes of limitations have not expired are subject to examination by the Internal Revenue Service and state departments of revenue.

(g) Reclassification. GAAP requires that certain components of net assets be adjusted to reflect permanent differences between financial and tax reporting. These reclassifications have no effect on net assets or net asset values per share. During the current year, the Fund had no reclassifications.

2. Investment management agreement and other transactions with affiliates

Legg Mason Partners Fund Advisor, LLC (“LMPFA”) is the Fund’s and the Portfolio’s investment manager and Western Asset Management Company (“Western Asset”) is the Fund’s and the Portfolio’s subadviser. LMPFA and Western Asset are wholly-owned subsidiaries of Legg Mason, Inc. (“Legg Mason”).

Under the investment management agreement, the Fund and the Portfolio pay investment management fees, calculated daily and paid monthly, at an annual rate of 0.25% and 0.10% of the Fund’s and the Portfolio’s average daily net assets, respectively.

LMPFA provides administrative and certain oversight services to the Fund. LMPFA delegates to the subadviser the day-to-day portfolio management of the Fund. For its services, LMPFA pays Western Asset 70% of the net management fee it receives from the Fund.

During the year ended August 31, 2008, the Fund had a voluntary expense limitation in place of 0.45% of the Fund’s average daily net assets.

During the year ended August 31, 2008, LMPFA waived a portion of its fee in the amount of $214,174.

Effective January 1, 2008, the manager is permitted to recapture amounts previously voluntarily forgone or reimbursed by the manager to the Fund during

14 | Citi^SM Premium U.S. Treasury Reserves 2008 Annual Report

the same fiscal year if the Fund’s total annual operating expenses have fallen to a level below the voluntary fee waiver/reimbursement (“expense cap”) shown in the fee table of the Fund’s prospectus. In no case will the manager recapture any amount that would result, on any particular business day of the Fund, in the Fund’s total annual operating expenses exceeding the expense cap.

Effective December 1, 2007, Legg Mason Investor Services, LLC (“LMIS”), a wholly-owned broker-dealer subsidiary of Legg Mason, serves as the Fund’s sole and exclusive distributor. Prior to December 1, 2007, Citigroup Global Markets Inc. (“CGM”) and LMIS served as co-distributors of the Fund.

The Fund has adopted a Rule 12b-1 distribution and service plan under the 1940 Act, and under that plan, the Fund pays a monthly fee at an annual rate not to exceed 0.10% of the Fund’s average daily net assets. The distribution fees paid amounted to $294,161 for the year ended August 31, 2008.

Certain officers and one Trustee of the Trust are employees of Legg Mason or its affiliates and do not receive compensation from the Trust.

3. Shares of beneficial interest

The Declaration of Trust permits the Trustees to issue an unlimited number of full and fractional shares of beneficial interest with a par value of $0.00001 per share.

Because the Fund has maintained a $1.00 net asset value per share from inception, the number of shares sold, shares issued in reinvestment of dividends declared, and shares repurchased, is equal to the dollar amount shown in the Statements of Changes in Net Assets for the corresponding capital share transactions.

4. Income tax information and distributions to shareholders

Subsequent to the fiscal year end, the Fund has made the following distributions:

RECORD DATE PAYABLE DATE
Daily 09/30/2008	$	0.000868

The tax character of distributions paid during the fiscal years ended August 31, were as follows:

	2008		2007
Distributions paid from:
Ordinary income	$	6,018,191	$	8,881,646

As of August 31, 2008, there were no significant differences between the book and tax components of net assets.

Citi^SM Premium U.S. Treasury Reserves 2008 Annual Report | 15

Notes to financial statements continued

5. Legal matters

Beginning in June 2004, class action lawsuits alleging violations of the federal securities laws were filed against CGM, a former distributor of the Fund and other affiliated funds (collectively, the “Funds”) and a number of its then affiliates, including Smith Barney Fund Management, LLC (“SBFM”) and Salomon Brothers Asset Management Inc. (“SBAM”), which were then investment adviser or manager to certain of the Funds (the “Managers”), substantially all of the mutual funds then managed by the Managers (the “Defendant Funds”), and Board members of the Defendant Funds (collectively, the “Defendants”). The complaints alleged, among other things, that CGM created various undisclosed incentives for its brokers to sell Smith Barney and Salomon Brothers funds. In addition, according to the complaints, the Managers caused the Defendant Funds to pay excessive brokerage commissions to CGM for steering clients towards proprietary funds. The complaints also alleged that the Defendants breached their fiduciary duty to the Defendant Funds by improperly charging Rule 12b-1 fees and by drawing on fund assets to make undisclosed payments of soft dollars and excessive brokerage commissions. The complaints also alleged that the Defendant Funds failed to adequately disclose certain of the allegedly wrongful conduct. The complaints sought injunctive relief and compensatory and punitive damages, rescission of the Defendant Funds’ contracts with the Managers, recovery of all fees paid to the Managers pursuant to such contracts and an award of attorneys’ fees and litigation expenses.

On December 15, 2004, a consolidated amended complaint (the “Complaint”) was filed alleging substantially similar causes of action. On May 27, 2005, all of the Defendants filed motions to dismiss the Complaint. On July 26, 2006, the court issued a decision and order (1) finding that plaintiffs lacked standing to sue on behalf of the shareholders of the Funds in which none of the plaintiffs had invested and dismissing those Funds from the case (although stating that they could be brought back into the case if standing as to them could be established), and (2) other than one stayed claim, dismissing all of the causes of action against the remaining Defendants, with prejudice, except for the cause of action under Section 36(b) of the 1940 Act, which the court granted plaintiffs leave to repeal as a derivative claim.

On October 16, 2006, plaintiffs filed their Second Consolidated Amended Complaint (“Second Amended Complaint”) which alleges derivative claims on behalf of nine funds identified in the Second Amended Complaint, under Section 36(b) of the 1940 Act, against Citigroup Asset Management (“CAM”), SBAM and SBFM as investment advisers to the identified funds, as well as CGM as a distributor for the identified funds (collectively, the “Second Amended Complaint Defendants”). The Fund was not identified in the Second Amended Complaint. The Second Amended Complaint alleges no claims against any of the funds or any of their Board Members. Under Section 36(b), the Second Amended Complaint alleges similar facts and seeks similar relief against the Second Amended Complaint Defendants as the Complaint.

16 | Citi^SM Premium U.S. Treasury Reserves 2008 Annual Report

On December 3, 2007, the court granted the Defendants’ motion to dismiss, with prejudice. On January 2, 2008, the plaintiffs filed a notice of appeal to the Second Circuit Court of Appeals.

Additional lawsuits arising out of these circumstances and presenting similar allegations and requests for relief may be filled in the future.

* * *

Beginning in August 2005, five class action lawsuits alleging violations of federal securities laws and state law were filed against CGM and SBFM, (collectively, the “Defendants”) based on the May 31, 2005 settlement order issued against the Defendants by the U.S. Securities and Exchange Commission (“SEC”) as previously described. The complaints seek injunctive relief and compensatory and punitive damages, removal of SBFM as the investment manager for the Smith Barney family of funds, rescission of the funds’ management and other contracts with SBFM, recovery of all fees paid to SBFM pursuant to such contracts, and an award of attorneys’ fees and litigation expenses. The five actions were subsequently consolidated, and a consolidated complaint was filed.

On September 26, 2007, the United States District Court for the Southern District of New York issued an order dismissing the consolidated complaint and judgment was later entered. An appeal has been filed and is pending before the U.S. Court of Appeals for the Second Circuit.

6. Other matters

On or about May 30, 2006, John Halebian, a purported shareholder of Citi^SM New York Tax Free Reserves, a series of Legg Mason Partners Money Market Trust, formerly a series of CitiFunds Trust III (the “Subject Trust”), filed a complaint in the United States District Court for the Southern District of New York against the independent trustees of the Subject Trust (Elliott J. Berv, Donald M. Carlton, A. Benton Cocanougher, Mark T. Finn, Stephen Randolph Gross, Diana R. Harrington, Susan B. Kerley, Alan G. Merten and R. Richardson Pettit).

The Subject Trust is also named in the complaint as a nominal defendant. The complaint alleges both derivative claims on behalf of the Subject Trust and class claims on behalf of a putative class of shareholders of the Subject Trust in connection with the 2005 sale of Citigroup’s asset management business to Legg Mason and the related approval of new investment advisory agreements by the trustees and shareholders. In the derivative claim, the plaintiff alleges, among other things, that the independent trustees breached their fiduciary duty to the Subject Trust and its shareholders by failing to negotiate lower fees or seek competing bids from other qualified investment advisers in connection with Citigroup’s sale to Legg Mason. In the claims brought on behalf of the putative class of shareholders, the plaintiff alleges that the independent trustees violated the proxy solicitation requirements of the 1940 Act, and breached their fiduciary

Citi^SM Premium U.S. Treasury Reserves 2008 Annual Report | 17

Notes to financial statements continued

duty to shareholders, by virtue of the voting procedures, including “echo voting,” used to obtain approval of the new investment advisory agreements and statements made in a proxy statement regarding those voting procedures. The plaintiff alleges that the proxy statement was misleading because it failed to disclose that the voting procedures violated the 1940 Act. The relief sought includes an award of damages, rescission of the advisory agreement, and an award of costs and attorney fees.

In advance of filing the complaint, Mr. Halebian’s lawyers made written demand for relief on the Board of the Subject Trust, and the Board’s independent trustees formed a demand review committee to investigate the matters raised in the demand, and subsequently in the complaint, and recommend a course of action to the Board. The committee, after a thorough review, determined that the independent trustees did not breach their fiduciary duties as alleged by Mr. Halebian, and that the action demanded by Mr. Halebian would not be in the best interests of the Subject Trust. The Board of the Subject Trust (the trustee who is an “interested person” of the Subject Trust, within the meaning of the 1940 Act, having recused himself from the matter), after receiving and considering the committee’s report and based upon the findings of the committee, subsequently also determined and, adopting the recommendation of the committee, directed counsel to move to dismiss Mr. Halebian’s complaint. A motion to dismiss was filed on October 23, 2006. Opposition papers were filed on or about December 7, 2006. The complaint was dismissed on July 31, 2007. Mr. Halebian has filed an appeal in the U.S. Court of Appeals for the Second Circuit. The appeal is pending.

7. Recent accounting pronouncements

On September 20, 2006, the Financial Accounting Standards Board (“FASB”) released Statement of Financial Accounting Standards No. 157, Fair Value Measurements (“FAS 157”). FAS 157 establishes an authoritative definition of fair value, sets out a framework for measuring fair value, and requires additional disclosures about fair value measurements. The application of FAS 157 is required for fiscal years beginning after November 15, 2007 and interim periods within those fiscal years. Management has determined that there is no material impact to the Fund’s valuation policies as a result of adopting FAS 157. The Fund will implement the disclosure requirements beginning with its November 30, 2008 Form N-Q.

* * *

In March 2008, FASB issued the Statement of Financial Accounting Standards No. 161, Disclosures about Derivative Instruments and Hedging Activities (“FAS 161”). FAS 161 is effective for fiscal years and interim periods beginning after November 15, 2008. FAS 161 requires enhanced disclosures about the Fund’s derivative and hedging activities, including how such activities are accounted for and their effect on the Fund’s financial position, performance and cash flows.

18 | Citi^SM Premium U.S. Treasury Reserves 2008 Annual Report

Management is currently evaluating the impact the adoption of FAS 161 will have on the Fund’s financial statements and related disclosures.

8. Subsequent events

Effective October 6, 2008, PNC Global Investment Servicing serves as co-transfer agent to the Fund, along with Boston Financial Data Services, Inc.

* * *

The Fund has enrolled in the U.S. Treasury Department’s Temporary Guarantee Program for money market funds (the “Guarantee Program”). Under the Guarantee Program, the U.S. Treasury guarantees the $1.00 dollar per share value of fund shares outstanding as of September 19, 2008, subject to certain terms and limitations.

Only shareholders who held shares as of September 19, 2008 are eligible to participate in the guarantee. Those shareholders may purchase and redeem shares in their account during the period covered by the Guarantee Program. However, the number of shares covered by the guarantee cannot exceed the number of shares held by the shareholder at the close of business on September 19, 2008. Thus, to the extent the overall value of a shareholder’s account increases after September 19, 2008, the amount of the increase will not be covered by the guarantee.

The guarantee will be triggered if the market-based net asset value of the Fund is less than $0.995, unless promptly cured (a “Guarantee Event”). If a Guarantee Event were to occur, the Fund would be required to liquidate. Upon liquidation and subject to the availability of funds under the Guarantee Program, eligible shareholders would be entitled to receive payments equal to $1.00 per “covered share.” The number of “covered shares” held by a shareholder would be equal to the lesser of (1) the number of shares owned by that shareholder on September 19, 2008 or (2) the number of shares owned by that shareholder on the date upon which the Guarantee Event occurs. The coverage provided for all money market funds participating in the Guarantee Program (and, in turn, any amount available to the Fund and its eligible shareholders) is subject to an overall limit, currently approximately $50 billion.

The initial term of the Guarantee Program terminates on December 18, 2008, but may be later extended by the Treasury Department to terminate no later than September 18, 2009. If the Treasury Department extends the Program, the Board of Trustees of the Fund will consider whether to continue to participate.

In order to participate in the Guarantee Program during the initial term, the Fund has paid a participation fee of 0.01% of the Fund’s net asset value as of September 19, 2008, which is not covered by any expense cap currently in effect. Participation in any extension of the Guarantee Program would require payment of an additional fee, although there can be no assurance that any Fund will elect to participate, or be eligible to participate, in any extension of the Guarantee Program.

Citi^SM Premium U.S. Treasury Reserves 2008 Annual Report | 19

Report of independent registered public accounting firm

The Board of Trustees and Shareholders
Legg Mason Partners Premium Money Market Trust:

          We have audited the accompanying statement of assets and liabilities of Citi^SM Premium U.S. Treasury Reserves, a series of Legg Mason Partners Premium Money Market Trust, as of August 31, 2008, and the related statement of operations for the year then ended, the statements of changes in net assets for each of the years in the two-year period then ended, and the financial highlights for each of the years in the five-year period then ended. These financial statements and financial highlights are the responsibility of the Fund’s management. Our responsibility is to express an opinion on these financial statements and financial highlights based on our audits.

          We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements and financial highlights are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.

          In our opinion, the financial statements and financial highlights referred to above present fairly, in all material respects, the financial position of Citi^SM Premium U.S. Treasury Reserves as of August 31, 2008, and the results of its operations for the year then ended, the changes in its net assets for each of the years in the two-year period then ended, and the financial highlights for each of the years in the five-year period then ended, in conformity with U.S. generally accepted accounting principles.

New York, New York
October 24, 2008

20 | Citi^SM Premium U.S. Treasury Reserves 2008 Annual Report

Additional information (unaudited)
Information about Trustees and Officers

The business and affairs of the Citi^SM Premium U.S. Treasury Reserves (the “Fund”) are managed under the direction of the Board of Trustees. Information pertaining to the Trustees and Officers of the Fund is set forth below. The Statement of Additional Information includes additional information about the Trustees and is available, without charge, upon request by calling Shareholder Services at 1-800-451-2010.

NON-INTERESTED TRUSTEES
ELLIOTT J. BERV c/o R. Jay Gerken, CFA, Legg Mason & Co., LLC (“Legg Mason”) 620 Eighth Avenue New York, NY 10018
Birth year	1943
Position(s) held with Fund1	Trustee
Term of office1 and length of time served2	Since 1989
Principal occupation(s) during past five years	President and Chief Executive Officer, Catalyst (consulting) (since 1984); Formerly, Chief Executive Officer, Rocket City Enterprises (media) (from 2000 to 2005)
Number of portfolios in fund complex over- seen by Trustee	68
Other board member- ships held by Trustee	Board Member, American Identity Corp. (doing business as Morpheus Technologies) (biometric information management) (since 2001); Director, Lapoint Industries (industrial filter company) (since 2002); Director, Alzheimer’s Association (New England Chapter) (since 1998)
A. BENTON COCANOUGHER c/o R. Jay Gerken, CFA, Legg Mason 620 Eighth Avenue New York, NY 10018
Birth year	1938
Position(s) held with Fund1	Trustee
Term of office1 and length of time served2	Since 1991
Principal occupation(s) during past five years	Dean Emeritus and Professor, Texas A&M University (since 2004); Formerly, Interim Chancellor, Texas A&M University System (from 2003 to 2004); Formerly, Special Advisor to the President, Texas A&M University (from 2002 to 2003)
Number of portfolios in fund complex over- seen by Trustee	68
Other board member- ships held by Trustee	None

Citi^SM Premium U.S. Treasury Reserves  | 21

Additional information (unaudited) continued
Information about Trustees and Officers

JANE F. DASHER c/o R. Jay Gerken, CFA, Legg Mason 620 Eighth Avenue New York, NY 10018
Birth year	1949
Position(s) held with Fund1	Trustee
Term of office1 and length of time served2	Since 1999
Principal occupation(s) during past five years	Chief Financial Officer, Korsant Partners, LLC (a family investment company)
Number of portfolios in fund complex over- seen by Trustee	68
Other board member- ships held by Trustee	None
MARK T. FINN c/o R. Jay Gerken, CFA, Legg Mason 620 Eighth Avenue New York, NY 10018
Birth year	1943
Position(s) held with Fund1	Trustee
Term of office1 and length of time served2	Since 1989
Principal occupation(s) during past five years	Adjunct Professor, College of William & Mary (since 2002); Principal/Member Balvan Partners (investment management) (since 2002); Chairman, Chief Executive Officer and Owner, Vantage Consulting Group, Inc. (investment management) (since 1988)
Number of portfolios in fund complex over- seen by Trustee	68
Other board member- ships held by Trustee	None
RAINER GREEVEN c/o R. Jay Gerken, CFA, Legg Mason 620 Eighth Avenue New York, NY 10018
Birth year	1936
Position(s) held with Fund1	Trustee
Term of office1 and length of time served2	Since 1994
Principal occupation(s) during past five years	Attorney, Rainer Greeven PC; President and Director, 62nd Street East Corporation (real estate) (since 2002)
Number of portfolios in fund complex over- seen by Trustee	68
Other board member- ships held by Trustee	None

22 | Citi^SM Premium U.S. Treasury Reserves

STEPHEN R. GROSS c/o R. Jay Gerken, CFA, Legg Mason 620 Eighth Avenue New York, NY 10018
Birth year	1947
Position(s) held with Fund1	Trustee
Term of office1 and length of time served2	Since 1986
Principal occupation(s) during past five years	Chairman, HLB Gross Collins, PC (accounting and consulting firm) (since 1979); Treasurer, Coventry Limited, Inc. (Senior Living Facilities) (since 1985); Formerly, Managing Director, Fountainhead Ventures, LLC (technology accelerator) (from 1998 to 2003)
Number of portfolios in fund complex over- seen by Trustee	68
Other board member- ships held by Trustee	Director, Andersen Calhoun (assisted living) (since 1987); Formerly, Director, ebank Financial Services, Inc. (from 1997 to 2004)
RICHARD E. HANSON, JR. c/o R. Jay Gerken, CFA, Legg Mason 620 Eighth Avenue New York, NY 10018
Birth year	1941
Position(s) held with Fund1	Trustee
Term of office1 and length of time served2	Since 1985
Principal occupation(s) during past five years	Retired
Number of portfolios in fund complex over- seen by Trustee	68
Other board member- ships held by Trustee	None
DIANA R. HARRINGTON c/o R. Jay Gerken, CFA, Legg Mason 620 Eighth Avenue New York, NY 10018
Birth year	1940
Position(s) held with Fund1	Trustee
Term of office1 and length of time served2	Since 1992
Principal occupation(s) during past five years	Professor, Babson College (since 1992)
Number of portfolios in fund complex over- seen by Trustee	68
Other board member- ships held by Trustee	None

Citi^SM Premium U.S. Treasury Reserves  | 23

Additional information (unaudited) continued
Information about Trustees and Officers

SUSAN M. HEILBRON c/o R. Jay Gerken, CFA, Legg Mason 620 Eighth Avenue New York, NY 10018
Birth year	1945
Position(s) held with Fund1	Trustee
Term of office1 and length of time served2	Since 1994
Principal occupation(s) during past five years	Independent Consultant (since 2001)
Number of portfolios in fund complex over- seen by Trustee	68
Other board member- ships held by Trustee	None
SUSAN B. KERLEY c/o R. Jay Gerken, CFA, Legg Mason 620 Eighth Avenue New York, NY 10018
Birth year	1951
Position(s) held with Fund1	Trustee
Term of office1 and length of time served2	Since 1992
Principal occupation(s) during past five years	Investment Consulting Partner, Strategic Management Advisors, LLC (investment consulting) (since 1990)
Number of portfolios in fund complex over- seen by Trustee	68
Other board member- ships held by Trustee	Chairman (since 2005) and Trustee (since 2000), Eclipse Funds (3 funds); Chairman (since 2005) and Director (since 1990), Eclipse Funds Inc. (23 funds); Chairman and Director, ICAP Funds, Inc. (4 funds) (since 2006); Chairman and Trustee, The MainStay Funds (21 funds) (since 2007); and Chairman and Director, MainStay VP Series Fund, Inc. (24 funds) (since 2007)
ALAN G. MERTEN c/o R. Jay Gerken, CFA, Legg Mason 620 Eighth Avenue New York, NY 10018
Birth year	1941
Position(s) held with Fund1	Trustee
Term of office1 and length of time served2	Since 1990
Principal occupation(s) during past five years	President, George Mason University (since 1996)
Number of portfolios in fund complex over- seen by Trustee	68
Other board member- ships held by Trustee	Director of Cardinal Financial Corporation (since 2006); Trustee, First Potomac Realty Trust (since 2005); Formerly, Director, Xybernaut Corporation (information technology) (from 2004 to 2006); Formerly, Director, Digital Net Holdings, Inc. (from 2003 to 2004); Formerly, Director, Comshare, Inc. (information technology) (from 1985 to 2003)

24 | Citi^SM Premium U.S. Treasury Reserves

R. RICHARDSON PETTIT c/o R. Jay Gerken, CFA, Legg Mason 620 Eighth Avenue New York, NY 10018
Birth year	1942
Position(s) held with Fund1	Trustee
Term of office1 and length of time served2	Since 1990
Principal occupation(s) during past five years	Formerly, Duncan Professor of Finance, University of Houston (from 1977 to 2006)
Number of portfolios in fund complex over- seen by Trustee	68
Other board member- ships held by Trustee	None
INTERESTED TRUSTEE
R. JAY GERKEN, CFA3 Legg Mason, 620 Eighth Avenue New York, NY 10018
Birth year	1951
Position(s) held with Fund1	Trustee, President, Chairman and Chief Executive Officer
Term of office1 and length of time served2	Since 2002
Principal occupation(s) during past five years	Managing Director of Legg Mason; Chairman of the Board and Trustee/Director of 164 funds associated with Legg Mason Partners Fund Advisor, LLC (“LMPFA”) and its affiliates; President LMPFA (since 2006); Chairman, President and Chief Executive Officer of certain mutual funds associated with Legg Mason and its affiliates; Formerly, Chairman, Smith Barney Fund Management LLC (“SBFM”) and Citi Fund Management Inc. (“CFM”) (2002 to 2005); Formerly, Chairman, President and Chief Executive Officer of Travelers Investment Adviser, Inc. (“TIA”) (from 2002 to 2005)
Number of portfolios in fund complex over- seen by Trustee	149
Other board member- ships held by Trustee	Trustee, Consulting Group Capital Market Funds (from 2002 to 2006)
OFFICERS
FRANCES M. GUGGINO Legg Mason, 55 Water Street New York, NY 10041
Birth year	1957
Position(s) held with Fund1	Chief Financial Officer and Treasurer
Term of office1 and length of time served2	Since 2004
Principal occupation(s) during past five years	Director of Legg Mason; Chief Financial Officer and Treasurer of certain mutual funds associated with Legg Mason; Formerly, Controller of certain mutual funds associated with Citigroup Asset Management (“CAM”) (from 1999 to 2004)

Citi^SM Premium U.S. Treasury Reserves | 25

Additional information (unaudited) continued
Information about Trustees and Officers

TED P. BECKER Legg Mason, 620 Eighth Avenue New York, NY 10018
Birth year	1951
Position(s) held with Fund1	Chief Compliance Officer
Term of office1 and length of time served2	Since 2006
Principal occupation(s) during past five years	Director of Global Compliance at Legg Mason (since 2006); Chief Compliance Officer of LMPFA (since 2006); Managing Director of Compliance at Legg Mason (since 2005); Chief Compliance Officer with certain mutual funds associated with Legg Mason, LMPFA and certain affiliates (since 2006); Formerly, Managing Director of Compliance at CAM or its predecessor (from 2002 to 2005)
JOHN CHIOTA Legg Mason, 300 First Stamford Place Stamford, CT 06902
Birth year	1968
Position(s) held with Fund1	Chief Anti-Money Laundering Compliance Officer
Term of office1 and length of time served2	Since 2006
Principal occupation(s) during past five years	Vice President of Legg Mason or its predecessor (since 2004); Chief Anti-Money Laundering Compliance Officer with certain mutual funds associated with Legg Mason or its affiliates (since 2006); Prior to August 2004, Chief AML Compliance Officer with TD Waterhouse
ROBERT I. FRENKEL Legg Mason, 300 First Stamford Place Stamford, CT 06902
Birth year	1954
Position(s) held with Fund1	Secretary and Chief Legal Officer
Term of office1 and length of time served2	Since 2003
Principal occupation(s) during past five years	Managing Director and General Counsel of Global Mutual Funds for Legg Mason and its predecessors (since 1994); Secretary and Chief Legal Officer of mutual funds associated with Legg Mason (since 2003); Formerly, Secretary of CFM (from 2001 to 2004)
THOMAS C. MANDIA Legg Mason, 300 First Stamford Place Stamford, CT 06902
Birth year	1962
Position(s) held with Fund1	Assistant Secretary
Term of office1 and length of time served2	Since 2000
Principal occupation(s) during	Managing Director and Deputy Counsel of Legg Mason (since 2005); Managing Director and Deputy General Counsel for CAM (from 1992 to 2005)

26 | Citi^SM Premium U.S. Treasury Reserves

DAVID CASTANO Legg Mason, 55 Water Street New York, NY 10041
Birth year	1971
Position(s) held with Fund1	Controller
Term of office1 and length of time served2	Since 2007
Principal occupation(s) during past 5 years	Vice President of Legg Mason (since 2008); Controller of certain mutual funds associated with Legg Mason (since 2007); Formerly, Assistant Treasurer of Lord Abbett mutual funds (from 2004 to 2006); Supervisor at UBS Global Asset Management (from 2003 to 2004); Accounting Manager at CAM (prior to 2003)
MATTHEW PLASTINA Legg Mason, 55 Water Street New York, NY 10041
Birth year	1970
Position(s) held with Fund1	Controller
Term of office1 and length of time served2	Since 2007
Principal occupation(s) during past 5 years	Vice President of Legg Mason (since 2008); Assistant Vice President of Legg Mason or its predecessor (since 1999); Controller of certain mutual funds associated with Legg Mason (since 2007); Formerly, Assistant Controller of certain mutual funds associated with Legg Mason and its predecessors (from 2002 to 2007)

1	Each Trustee and Officer serves until his or her successor has been duly elected and qualified or until his or her earlier death, resignation, retirement or removal.
2	Indicates the earliest year in which the Trustee or Officer became a Board Member or Officer, as applicable, for a fund in the Legg Mason Partners fund complex.
3	Mr. Gerken is an “interested person” of the Fund as defined in the 1940 Act, because Mr. Gerken is an officer of LMPFA and certain of its affiliates.

Citi^SM Premium U.S. Treasury Reserves | 27

Important tax information (unaudited)

All of the net investment income distributions paid monthly by the Fund during the taxable year ended August 31, 2008 were attributable to interest from Federal obligations.

The law varies in each state as to whether and what percentage of dividend income attributable to Federal obligations is exempt from state income tax. We recommend that you consult with your tax adviser to determine if any portion of the dividends you received is exempt from state income taxes.

The following information is applicable to non-U.S. resident shareholders:

All of the ordinary income distributions paid monthly by the Fund represent Qualified Net Interest Income and Qualified Short-Term Gain eligible for exemption from U.S. withholding tax for nonresident aliens and foreign corporations.

Please retain this information for your records.

28 | Citi^SM Premium U.S. Treasury Reserves

Schedule of investments
August 31, 2008

U.S. TREASURY RESERVES PORTFOLIO
FACE AMOUNT		SECURITY	VALUE
SHORT-TERM INVESTMENTS — 100.0%
		U.S. Treasury Notes — 2.7%
		U.S. Treasury Notes:
$	150,000,000	3.125% due 9/15/08	$	150,089,627
	100,000,000	4.625% due 9/30/08		100,226,562
	130,000,000	4.875% due 10/31/08		130,614,411
		Total U.S. Treasury Notes
		(Cost — $380,930,600)		380,930,600
		U.S. Treasury Bills — 97.3%
	1,080,518,000	U.S. Cash Management Bills, 1.611- 1.938% due 9/15/08 (a)		1,079,748,488
		U.S. Treasury Bills:
	1,466,843,000	1.587 - 1.828% due 9/4/08 (a)		1,466,631,403
	1,306,530,000	1.733 - 1.919% due 9/11/08 (a)		1,305,868,064
	2,046,994,000	1.702 - 2.056% due 9/18/08 (a)		2,045,206,829
	1,140,000,000	1.707 - 1.859% due 9/25/08 (a)		1,138,691,867
	400,000,000	1.889 - 1.904% due 10/2/08 (a)		399,350,507
	572,776,000	1.759 - 1.869% due 10/9/08 (a)		571,678,583
	129,954,000	1.612% due 10/16/08 (a)		129,693,280
	8,060,000	1.521% due 10/23/08 (a)		8,042,362
	700,000,000	1.697 - 1.707% due 10/30/08 (a)		698,057,918
	575,000,000	1.712 - 1.755% due 11/6/08 (a)		573,196,458
	507,065,000	1.862 - 2.215% due 11/13/08 (a)		505,088,153
	400,000,000	1.854 - 1.898% due 11/20/08 (a)		398,351,666
	362,602,000	1.707 - 1.934% due 11/28/08 (a)		361,038,812
	200,000,000	1.752 - 1.964% due 12/4/08 (a)		199,037,806
	200,000,000	1.949 - 2.066% due 12/11/08 (a)		198,868,660
	350,000,000	1.724 - 2.373% due 12/18/08 (a)		347,993,000
	285,000,000	1.740 - 2.276% due 12/26/08 (a)		283,213,882
	100,000,000	2.153% due 1/2/09 (a)		99,272,250
	392,331,000	1.821 - 2.077% due 1/8/09 (a)		389,635,286
	709,120,000	1.772 - 1.969% due 1/15/09 (a)		704,103,899
	50,000,000	1.934% due 1/22/09 (a)		49,619,660
	235,525,000	1.827 - 1.893% due 1/29/09 (a)		233,703,847
	171,959,000	1.888 - 1.934% due 2/5/09 (a)		170,527,189
	150,000,000	2.036% due 2/12/09 (a)		148,623,084
	225,000,000	1.918 - 1.995% due 2/19/09 (a)		222,915,937
	100,000,000	1.939% due 2/26/09 (a)		99,050,666
	150,000,000	2.148 - 2.448% due 6/4/09 (a)		147,471,917
	25,000,000	2.350% due 7/2/09 (a)		24,515,500
	25,000,000	2.355% due 7/30/09 (a)		24,469,722
		Total U.S. Treasury Bills
		(Cost — $14,023,666,695)		14,023,666,695
		TOTAL INVESTMENTS — 100.0% (Cost — $14,404,597,295#)		14,404,597,295
		Other Assets in Excess of Liabilities — 0.0%		5,115,114
		TOTAL NET ASSETS — 100.0%	$	14,409,712,409

(a)	Rate shown represents yield-to-maturity.
#	Aggregate cost for federal income tax purposes is substantially the same.

See Notes to Financial Statements.

U.S. Treasury Reserves Portfolio 2008 Annual Report | 29

Statement of assets and liabilities

U.S. Treasury Reserves Portfolio
August 31, 2008

ASSETS:
Investments, at amortized cost	$	14,404,597,295
Cash		795
Interest receivable		6,246,922
Prepaid expenses		142,301
Total Assets		14,410,987,313
LIABILITIES:
Investment management fee payable		1,158,604
Trustees’ fees payable		44,000
Accrued expenses		72,300
Total Liabilities		1,274,904
TOTAL NET ASSETS	$	14,409,712,409
REPRESENTED BY:
Paid-in capital	$	14,409,712,409

See Notes to Financial Statements.

30 | U.S. Treasury Reserves Portfolio 2008 Annual Report

Statement of operations

U.S. Treasury Reserves Portfolio
For the Year Ended August 31, 2008

INVESTMENT INCOME:
Interest	$	219,883,514
EXPENSES:
Investment management fee (Note 2)		9,645,754
Trustees’ fees		179,010
Legal fees		177,504
Custody fees		60,215
Insurance		32,878
Audit and tax		24,900
Miscellaneous expenses		33,923
Total Expenses		10,154,184
Less: Fee waivers and/or expense reimbursements (Note 2)		(506,058	)
Fees paid indirectly (Note 1)		(2,372	)
Net Expenses		9,645,754
NET INVESTMENT INCOME		210,237,760
NET REALIZED GAIN ON INVESTMENT TRANSACTIONS		111,668
INCREASE IN NET ASSETS FROM OPERATIONS	$	210,349,428

See Notes to Financial Statements.

U.S. Treasury Reserves Portfolio 2008 Annual Report | 31

Statements of changes in net assets

U.S. Treasury Reserves Portfolio

FOR THE YEARS ENDED AUGUST 31,	2008			2007
OPERATIONS:
Net investment income	$	210,237,760		$	83,196,299
Net realized gain		111,668			4,160
Increase in Net Assets From Operations		210,349,428			83,200,459
CAPITAL TRANSACTIONS:
Proceeds from contributions		28,002,585,878			10,105,899,574
Value of withdrawals		(18,229,220,393	)		(7,253,588,398	)
Increase in Net Assets From Capital Transactions		9,773,365,485			2,852,311,176
INCREASE IN NET ASSETS		9,983,714,913			2,935,511,635
NET ASSETS:
Beginning of year		4,425,997,496			1,490,485,861
End of year	$	14,409,712,409		$	4,425,997,496

See Notes to Financial Statements.

32 | U.S. Treasury Reserves Portfolio 2008 Annual Report

Financial highlights

U.S. Treasury Reserves Portfolio

FOR A SHARE OF BENEFICIAL INTEREST OUTSTANDING FOR EACH YEAR ENDED AUGUST 31:

	2008			2007			2006			2005			2004
NET ASSETS, END OF YEAR (000s)	$	14,409,712		$	4,425,997		$	1,490,486		$	1,218,904		$	1,562,711
Total return1		2.59	%		4.96	%		4.21	%		2.25	%		0.92	%
RATIOS TO AVERAGE NET ASSETS:
Gross expenses		0.11	%		0.12	%2		0.13	%		0.18	%		0.18	%
Net expenses3,4,5		0.10			0.10	2		0.10			0.10			0.10
Net investment income		2.18			4.76			4.16			2.16			0.91

1	Performance figures may reflect fee waivers and/or expense reimbursements. In the absence of fee waivers and/or expense reimbursements, the total return would have been lower. Past performance is no guarantee of future results.
2	Included in the expense ratios are certain non-recurring restructuring (and reorganization, if applicable) fees that were incurred by the Fund during the period. Without these fees, the gross and net expense ratios would not have changed.
3	Reflects fee waivers and/or expense reimbursements.
4	There was no impact to the expense ratio as a result of fees paid indirectly.
5	As a result of a voluntary expense limitation, the ratio of expenses, other than interest, brokerage, taxes and extraordinary expenses, to average net assets of shares will not exceed 0.10%.

See Notes to Financial Statements.

U.S. Treasury Reserves Portfolio 2008 Annual Report | 33

Notes to financial statements

1. Organization and significant accounting policies

U.S. Treasury Reserves Portfolio (the “Portfolio”) is a no-load, diversified investment series of Master Portfolio Trust (the “Trust”). The Trust, a Maryland business trust, is registered under the Investment Company Act of 1940, as amended (the “1940 Act”), as an open-end management investment company. At August 31, 2008, all investors in the Portfolio were funds advised or administered by the manager of the Portfolio and/or its affiliates.

The following are significant accounting policies consistently followed by the Portfolio and are in conformity with U.S. generally accepted accounting principles (“GAAP”). Estimates and assumptions are required to be made regarding assets, liabilities and changes in net assets resulting from operations when financial statements are prepared. Changes in the economic environment, financial markets and any other parameters used in determining these estimates could cause actual results to differ.

(a) Investment valuation. Money market instruments are valued at amortized cost, in accordance with Rule 2a-7 under the Investment Company Act of 1940, which approximates market value. This method involves valuing portfolio securities at their cost and thereafter assuming a constant amortization to maturity of any discount or premium. The Portfolio’s use of amortized cost is subject to its compliance with certain conditions as specified by Rule 2a-7 of the 1940 Act.

The fair value of the security may be different than the amortized cost value reported in the Schedule of Investments. As of the date of this report, the Portfolio continued to meet the requirements of Rule 2a-7 that permit the Portfolio to utilize amortized cost to value its securities.

(b) Interest income and expenses. Interest income consists of interest accrued and discount earned (including both original issue and market discount adjusted for amortization of premium) on the investments of the Portfolio. Expenses of the Portfolio are accrued daily. The Portfolio bears all costs of its operations other than expenses specifically assumed by the manager.

(c) Fees paid indirectly. The Portfolio’s custody fees are reduced according to a fee arrangement, which provides for a reduction based on the value of cash deposited with the custodian by the Portfolio. If material, the amount is shown as a reduction of expenses on the Statement of Operations.

(d) Income taxes. The Portfolio is classified as a partnership for Federal income tax purposes. As such, each investor in the Portfolio is treated as owner of its proportionate share of the net assets, income, expenses and realized and unrealized gains and losses of the Portfolio. Therefore, no Federal income tax provision is required. It is intended that the Portfolio’s assets will be managed so an investor in the Portfolio can satisfy the requirements of the subchapter M of the Internal Revenue Code.

34 | U.S. Treasury Reserves Portfolio 2008 Annual Report

Management has analyzed the Portfolio’s tax positions taken on federal income tax returns for all open tax years and has concluded that as of August 31, 2008, no provision for income tax would be required in the Portfolio’s financial statements. The Portfolio’s federal and state income tax return for tax years for which the applicable statutes of limitations have not expired are subject to examination by the Internal Revenue Service and state departments of revenue.

(e) Other. Purchases, maturities and sales of money market instruments are accounted for on the date of the transaction. Realized gains and losses are calculated on the identified cost basis.

2. Investment management agreement and other transactions with affiliates

Legg Mason Partners Fund Advisor, LLC (“LMPFA”) is the Portfolio’s investment manager and Western Asset Management Company (“Western Asset”) is the Portfolio’s subadviser. LMPFA and Western Asset are wholly-owned subsidiaries of Legg Mason, Inc. (“Legg Mason”).

Under the investment management agreement, the Portfolio pays an investment management fee, calculated daily and paid monthly, at an annual rate of 0.10% of the Portfolio’s average daily net assets.

LMPFA provides administrative and certain oversight services to the Portfolio. LMPFA delegates to the subadviser the day-to-day portfolio management of the Portfolio. For its services, LMPFA pays Western Asset 70% of the net management fee it receives from the Portfolio.

During the year ended August 31, 2008, the Portfolio had a voluntary expense limitation in place of 0.10% of the Portfolio’s average daily net assets.

During the year ended August 31, 2008, the manager waived a portion of its fee in the amount of $506,058.

Effective January 1, 2008, the manager is permitted to recapture amounts previously voluntarily forgone or reimbursed by the manager to the Portfolio during the same fiscal year if the Portfolio’s total annual operating expenses have fallen to a level below the voluntary fee waiver/reimbursement (“expense cap”). In no case will the manager recapture any amount that would result, on any particular business day of the Portfolio, in the Portfolio’s total annual operating expenses exceeding the expense cap.

Certain officers and one Trustee of the Trust are employees of Legg Mason or its affiliates and do not receive compensation from the Trust.

U.S. Treasury Reserves Portfolio 2008 Annual Report | 35

Notes to financial statements continued

3. Legal matters

Beginning in June 2004, class action lawsuits alleging violations of the federal securities laws were filed against Citigroup Global Markets Inc. (“CGM”), a former distributor of the Fund and other affiliated funds (collectively, the “Funds”) and a number of its then affiliates, including Smith Barney Fund Management, LLC (“SBFM”) and Salomon Brothers Asset Management Inc. (“SBAM”), which were then investment adviser or manager to certain of the Funds (the “Managers”), substantially all of the mutual funds then managed by the Managers (the “Defendant Funds”), and Board members of the Defendant Funds (collectively, the “Defendants”). The complaints alleged, among other things, that CGM created various undisclosed incentives for its brokers to sell Smith Barney and Salomon Brothers funds. In addition, according to the complaints, the Managers caused the Defendant Funds to pay excessive brokerage commissions to CGM for steering clients towards proprietary funds. The complaints also alleged that the Defendants breached their fiduciary duty to the Defendant Funds by improperly charging Rule 12b-1 fees and by drawing on fund assets to make undisclosed payments of soft dollars and excessive brokerage commissions. The complaints also alleged that the Defendant Funds failed to adequately disclose certain of the allegedly wrongful conduct. The complaints sought injunctive relief and compensatory and punitive damages, rescission of the Defendant Funds’ contracts with the Managers, recovery of all fees paid to the Managers pursuant to such contracts and an award of attorneys’ fees and litigation expenses.

On December 15, 2004, a consolidated amended complaint (the “Complaint”) was filed alleging substantially similar causes of action. On May 27, 2005, all of the Defendants filed motions to dismiss the Complaint. On July 26, 2006, the court issued a decision and order (1) finding that plaintiffs lacked standing to sue on behalf of the shareholders of the Funds in which none of the plaintiffs had invested and dismissing those Funds from the case (although stating that they could be brought back into the case if standing as to them could be established), and (2) other than one stayed claim, dismissing all of the causes of action against the remaining Defendants, with prejudice, except for the cause of action under Section 36(b) of the 1940 Act, which the court granted plaintiffs leave to repeal as a derivative claim.

On October 16, 2006, plaintiffs filed their Second Consolidated Amended Complaint (“Second Amended Complaint”) which alleges derivative claims on behalf of nine funds identified in the Second Amended Complaint, under Section 36(b) of the 1940 Act, against Citigroup Asset Management (“CAM”), SBAM and SBFM as investment advisers to the identified funds, as well as CGM as a distributor for the identified funds (collectively, the “Second Amended Complaint Defendants”). The Portfolio was not identified in the Second Amended Complaint. The Second Amended Complaint alleges no claims against any of the funds or any of their Board Members. Under Section 36(b), the Second Amended Complaint alleges similar facts and seeks similar relief against the Second Amended Complaint Defendants as the Complaint.

36 | U.S. Treasury Reserves Portfolio 2008 Annual Report

On December 3, 2007, the court granted the Defendants’ motion to dismiss, with prejudice. On January 2, 2008, the plaintiffs filed a notice of appeal to the Second Circuit Court of Appeals.

Additional lawsuits arising out of these circumstances and presenting similar allegations and requests for relief may be filled in the future.

* * *

Beginning in August 2005, five class action lawsuits alleging violations of federal securities laws and state law were filed against CGM and SBFM, (collectively, the “Defendants”) based on the May 31, 2005 settlement order issued against the Defendants by the U.S. Securities and Exchange Commission (“SEC”) as previously described. The complaints seek injunctive relief and compensatory and punitive damages, removal of SBFM as the investment manager for the Smith Barney family of funds, rescission of the funds’ management and other contracts with SBFM, recovery of all fees paid to SBFM pursuant to such contracts, and an award of attorneys’ fees and litigation expenses. The five actions were subsequently consolidated, and a consolidated complaint was filed.

On September 26, 2007, the United States District Court for the Southern District of New York issued an order dismissing the consolidated complaint and judgment was later entered. An appeal has been filed and is pending before the U.S. Court of Appeals for the Second Circuit.

4. Other matters

On or about May 30, 2006, John Halebian, a purported shareholder of CitiSM New York Tax Free Reserves, a series of Legg Mason Partners Money Market Trust, formerly a series of CitiFunds Trust III (the “Subject Trust”), filed a complaint in the United States District Court for the Southern District of New York against the independent trustees of the Subject Trust (Elliott J. Berv, Donald M. Carlton, A. Benton Cocanougher, Mark T. Finn, Stephen Randolph Gross, Diana R. Harrington, Susan B. Kerley, Alan G. Merten and R. Richardson Pettit).

The Subject Trust is also named in the complaint as a nominal defendant. The complaint alleges both derivative claims on behalf of the Subject Trust and class claims on behalf of a putative class of shareholders of the Subject Trust in connection with the 2005 sale of Citigroup’s asset management business to Legg Mason and the related approval of new investment advisory agreements by the trustees and shareholders. In the derivative claim, the plaintiff alleges, among other things, that the independent trustees breached their fiduciary duty to the Subject Trust and its shareholders by failing to negotiate lower fees or seek competing bids from other qualified investment advisers in connection with Citigroup’s sale to Legg Mason. In the claims brought on behalf of the putative class of shareholders, the plaintiff alleges that the independent trustees violated the proxy solicitation requirements of the 1940 Act, and breached their fiduciary duty to shareholders, by virtue of the voting procedures, including “echo voting,”

U.S. Treasury Reserves Portfolio 2008 Annual Report | 37

Notes to financial statements continued

used to obtain approval of the new investment advisory agreements and statements made in a proxy statement regarding those voting procedures. The plaintiff alleges that the proxy statement was misleading because it failed to disclose that the voting procedures violated the 1940 Act. The relief sought includes an award of damages, rescission of the advisory agreement, and an award of costs and attorney fees.

In advance of filing the complaint, Mr. Halebian’s lawyers made written demand for relief on the Board of the Subject Trust, and the Board’s independent trustees formed a demand review committee to investigate the matters raised in the demand, and subsequently in the complaint, and recommend a course of action to the Board. The committee, after a thorough review, determined that the independent trustees did not breach their fiduciary duties as alleged by Mr. Halebian, and that the action demanded by Mr. Halebian would not be in the best interests of the Subject Trust. The Board of the Subject Trust (the trustee who is an “interested person” of the Subject Trust, within the meaning of the 1940 Act, having recused himself from the matter), after receiving and considering the committee’s report and based upon the findings of the committee, subsequently also determined and, adopting the recommendation of the committee, directed counsel to move to dismiss Mr. Halebian’s complaint. A motion to dismiss was filed on October 23, 2006. Opposition papers were filed on or about December 7, 2006. The complaint was dismissed on July 31, 2007. Mr. Halebian has filed an appeal in the U.S. Court of Appeals for the Second Circuit. The appeal is pending.

5. Recent accounting pronouncements

On September 20, 2006, the Financial Accounting Standards Board (“FASB”) released Statement of Financial Accounting Standards No. 157, Fair Value Measurements (“FAS 157”). FAS 157 establishes an authoritative definition of fair value, sets out a framework for measuring fair value, and requires additional disclosures about fair value measurements. The application of FAS 157 is required for fiscal years beginning after November 15, 2007 and interim periods within those fiscal years. Management has determined that there is no material impact to the Portfolio’s valuation policies as a result of adopting FAS 157. The Portfolio will implement the disclosure requirements beginning with its November 30, 2008 Form N-Q.

* * *

In March 2008, FASB issued the Statement of Financial Accounting Standards No. 161, Disclosures about Derivative Instruments and Hedging Activities (“FAS 161”). FAS 161 is effective for fiscal years and interim periods beginning after November 15, 2008. FAS 161 requires enhanced disclosures about the Portfolio’s derivative and hedging activities, including how such activities are accounted for and their effect on the Portfolio’s financial position, performance and cash flows. Management is currently evaluating the impact the adoption of FAS 161 will have on the Portfolio’s financial statements and related disclosures.

38 | U.S. Treasury Reserves Portfolio 2008 Annual Report

Report of independent registered public accounting firm

The Board of Trustees and Investors
Master Portfolio Trust:

          We have audited the accompanying statement of assets and liabilities, including the schedule of investments, of U.S. Treasury Reserves Portfolio, a series of Master Portfolio Trust, as of August 31, 2008, and the related statement of operations for the year then ended, the statements of changes in net assets for each of the years in the two-year period then ended, and the financial highlights for each of the years in the five-year period then ended. These financial statements and financial highlights are the responsibility of the Portfolio’s management. Our responsibility is to express an opinion on these financial statements and financial highlights based on our audits.

          We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements and financial highlights are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements. Our procedures included confirmation of securities owned as of August 31, 2008, by correspondence with the custodian. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.

          In our opinion, the financial statements and financial highlights referred to above present fairly, in all material respects, the financial position of U.S. Treasury Reserves Portfolio as of August 31, 2008, and the results of its operations for the year then ended, the changes in its net assets for each of the years in the two-year period then ended, and the financial highlights for each of the years in the five-year period then ended, in conformity with U.S. generally accepted accounting principles.

New York, New York
October 24, 2008

U.S. Treasury Reserves Portfolio 2008 Annual Report | 39

Additional information (unaudited)

The Trustees and Officers of the Fund also serve as the Trustees and Officers of the Portfolio. Information about the Trustees and Officers of the Fund can be found on pages 21 through 27 of this report.

40 | U.S. Treasury Reserves Portfolio

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CitiSM Premium U.S. Treasury Reserves
Trustees	Distributor
Elliott J. Berv	Legg Mason Investor Services, LLC
A. Benton Cocanougher
Jane F. Dasher	Custodian
Mark T. Finn	State Street Bank and Trust
R. Jay Gerken, CFA	Company
Chairman
Rainer Greeven	Transfer agents
Stephen R. Gross	Boston Financial Data Services, Inc.
Richard E. Hanson, Jr.	2 Heritage Drive
Diana R. Harrington	North Quincy, Massachusetts 02171
Susan M. Heilbron
Susan B. Kerley	PNC Global Investment Services
Alan G. Merten	(formerly, PFPC, Inc.)
R. Richardson Pettit	4400 Computer Drive
	Westborough, Massachusetts 01581
Investment manager
Legg Mason Partners Fund	Independent registered
Advisor, LLC	public accounting firm
	KPMG LLP
Subadviser	345 Park Avenue
Western Asset Management	New York, New York 10154
Company

Citi^SM Premium U.S. Treasury Reserves

The Fund is a separate investment series of Legg Mason Partners Premium Money Market Trust, a Maryland business trust.

CITI^SM PREMIUM U.S. TREASURY RESERVES
55 Water Street
New York, New York 10041

The Fund files its complete schedule of portfolio holdings with the Securities and Exchange Commission (“SEC”) for the first and third quarters of each fiscal year on Form N-Q. The Fund’s Forms N-Q are available on the SEC’s website at www.sec.gov. The Fund’s Forms N-Q may be reviewed and copied at the SEC’s Public Reference Room in Washington D.C., and information on the operation of the Public Reference Room may be obtained by calling 1-800-SEC-0330. To obtain information on Form N-Q from the Fund, shareholders can call 1-800-451-2010.

Information on how the Fund voted proxies relating to portfolio securities during the prior 12-month period ending June 30th of each year and a description of the policies and procedures that the Fund uses to determine how to vote proxies related to portfolio transactions are available (1) without charge, upon request, by calling 1-800-451-2010, (2) on the Fund’s website at www.leggmason.com/individualinvestors and (3) on the SEC’s website at www.sec.gov.

This report is submitted for the general information of the shareholders of Citi^SM Premium U.S. Treasury Reserves. This report is not authorized for distribution to prospective investors in the Fund unless preceded or accompanied by a current prospectus.

Investors should consider the Fund’s investment objective, risks, charges and expenses carefully before investing. The prospectus contains this and other important information about the Fund. Please read the prospectus carefully before investing.

www.leggmason.com/individualinvestors

© 2008 Legg Mason Investor Services, LLC

Member FINRA, SIPC

	BUILT TO WINSM
At Legg Mason, we’ve assembled a collection of experienced investment management firms and empowered each of them with the tools, the resources and, most importantly, the independence to pursue the strategies they know best.
•	Each was purposefully chosen for their commitment to investment excellence.
•	Each is focused on specific investment styles and asset classes.
•	Each exhibits thought leadership in their chosen area of focus.
Together, we’ve built a powerful portfolio of solutions for financial advisors and their clients. And it has made us a world leader in money management.*
*	Ranked ninth-largest money manager in the world, according to Pensions & Investments, May 26, 2008, based on 12/31/07 worldwide assets under management.
	www.leggmason.com/individualinvestors
	© 2008 Legg Mason Investor Services, LLC Member FINRA, SIPC
	FDXX010351 10/08       SR08-680
NOT PART OF THE ANNUAL REPORT

ITEM 2.	CODE OF ETHICS.
	The registrant has adopted a code of ethics that applies to the registrant’s principal executive officer, principal financial officer, principal accounting officer or controller.
ITEM 3.	AUDIT COMMITTEE FINANCIAL EXPERT.
	The Board of Trustees of the registrant has determined that Stephen R. Gross the Chairman of the Board’s Audit Committee and Jane F. Dasher, possess the technical attributes identified in Instruction 2(b) of Item 3 to Form N-CSR to qualify as “audit committee financial experts,” and have designated Mr. Gross and Ms. Dasher as the Audit Committee’s financial experts. Mr. Gross and Ms. Dasher are “independent” Trustees pursuant to paragraph (a) (2) of Item 3 to Form N-CSR.
ITEM 4.	PRINCIPAL ACCOUNTANT FEES AND SERVICES.
	a) Audit Fees. The aggregate fees billed in the last two fiscal years ending August 31, 2007 and August 31, 2008 (the "Reporting Periods") for professional services rendered by the Registrant's principal accountant (the "Auditor") for the audit of the Registrant's annual financial statements, or services that are normally provided by the Auditor in connection with the statutory and regulatory filings or engagements for the Reporting Periods, were $30,350 in 2007 and $31,600 in 2008. b) Audit-Related Fees. The aggregate fees billed in the Reporting Period for assurance and related services by the Auditor that are reasonably related to the performance of the Registrant’s financial statements were $9,000 in 2007 and $0 in 2008. These services consisted of procedures performed in connection with the Re-domiciliation of the various reviews of Prospectus supplements, and consent issuances related to the N-1A filings for the Legg Mason Partners Premium Money Market Trust. In addition, there were no Audit-Related Fees billed in the Reporting Period for assurance and related services by the Auditor to the Registrant’s investment adviser (not including any sub-adviser whose role is primarily portfolio management and is subcontracted with or overseen by another investment adviser), and any entity controlling, controlled by or under common control with the investment adviser that provides ongoing services to the Legg Mason Partners Premium Money Market Trust (“service affiliates”), that were reasonably related to the performance of the annual audit of the service affiliates. Accordingly, there were no such fees that required pre-approval by the Audit Committee for the Reporting Periods (prior to May 6, 2003 services provided by the Auditor were not required to be pre-approved). (c) Tax Fees. The aggregate fees billed in the Reporting Periods for professional services rendered by the Auditor for tax compliance, tax advice and tax planning ("Tax Services") were $8,600 in 2007 and $4,800 in 2008. These services consisted of (i) review or preparation of U.S. federal, state, local and excise tax returns; (ii) U.S. federal, state and local tax planning, advice and assistance regarding statutory, regulatory or administrative developments, and (iii) tax advice regarding tax qualification matters and/or treatment of various financial instruments held or proposed to be acquired or held. There were no fees billed for tax services by the Auditors to service affiliates during the Reporting Periods that required pre-approval by the Audit Committee. d) All Other Fees. There were no other fees billed in the Reporting Periods for products and services provided by the Auditor, other than the services reported in paragraphs (a) through (c) of this Item for the Legg Mason Partners Premium Money Market Trust. All Other Fees. There were no other non-audit services rendered by the Auditor to Legg Mason Partners Fund Advisors, LLC (“LMPFA”) and any entity controlling, controlled by or under common control with LMPFA that provided ongoing services to Legg Mason Partners Premium Money Market Trust requiring pre-approval by the Audit Committee in the Reporting Period. (e) Audit Committee’s pre–approval policies and procedures described in paragraph (c) (7) of Rule 2-01 of Regulation S-X. (1) The Charter for the Audit Committee (the “Committee”) of the Board of each registered investment company (the “Fund”) advised by LMPFA or one of their affiliates (each, an “Adviser”) requires that the Committee shall approve (a) all audit and permissible non-audit services to be provided to the Fund and (b) all permissible non-audit services to be provided by the Fund’s independent auditors to the Adviser and any Covered Service Providers if the engagement relates directly to the operations and financial reporting of the Fund. The Committee may implement policies and procedures by which such services are approved other than by the full Committee.

	The Committee shall not approve non-audit services that the Committee believes may impair the independence of the auditors. As of the date of the approval of this Audit Committee Charter, permissible non-audit services include any professional services (including tax services), that are not prohibited services as described below, provided to the Fund by the independent auditors, other than those provided to the Fund in connection with an audit or a review of the financial statements of the Fund. Permissible non-audit services may not include: (i) bookkeeping or other services related to the accounting records or financial statements of the Fund; (ii) financial information systems design and implementation; (iii) appraisal or valuation services, fairness opinions or contribution-in-kind reports; (iv) actuarial services; (v) internal audit outsourcing services; (vi) management functions or human resources; (vii) broker or dealer, investment adviser or investment banking services; (viii) legal services and expert services unrelated to the audit; and (ix) any other service the Public Company Accounting Oversight Board determines, by regulation, is impermissible. Pre-approval by the Committee of any permissible non-audit services is not required so long as: (i) the aggregate amount of all such permissible non-audit services provided to the Fund, the Adviser and any service providers controlling, controlled by or under common control with the Adviser that provide ongoing services to the Fund (“Covered Service Providers”) constitutes not more than 5% of the total amount of revenues paid to the independent auditors during the fiscal year in which the permissible non-audit services are provided to (a) the Fund, (b) the Adviser and (c) any entity controlling, controlled by or under common control with the Adviser that provides ongoing services to the Fund during the fiscal year in which the services are provided that would have to be approved by the Committee; (ii) the permissible non-audit services were not recognized by the Fund at the time of the engagement to be non-audit services; and (iii) such services are promptly brought to the attention of the Committee and approved by the Committee (or its delegate(s)) prior to the completion of the audit. (2) For the Legg Mason Partners Premium Money Market Trust, the percentage of fees that were approved by the audit committee, with respect to: Audit-Related Fees were 100% and 0% for 2007 and 2008; Tax Fees were 100% and 0% for 2007 and 2008; and Other Fees were 100% and 0% for 2007 and 2008. (f)N/A (g) Non-audit fees billed by the Auditor for services rendered to Legg Mason Partners Premium Money Market Trust, LMPFA and any entity controlling, controlled by, or under common control with LMPFA that provides ongoing services to Legg Mason Partners Premium Money Market Trust during the reporting period were $0 in 2008. (h) Yes. Legg Mason Partners Premium Money Market Trust’s Audit Committee has considered whether the provision of non-audit services that were rendered to Service Affiliates, which were not pre-approved (not requiring pre-approval), is compatible with maintaining the Accountant's independence. All services provided by the Auditor to the Legg Mason Partners Premium Money Market Trust or to Service Affiliates, which were required to be pre-approved, were pre-approved as required.
ITEM 5.	AUDIT COMMITTEE OF LISTED REGISTRANTS.
	a)	The independent board members are acting as the registrant’s audit committee as specified in Section 3(a)(58)(B) of the Exchange Act. The Audit Committee consists of the following Board members:
		Elliott J. Berv
		A. Benton Cocanougher
		Jane F. Dasher
		Mark T. Finn
		Rainer N. K. Greeven
		Stephen R. Gross
		Richard E. Hanson, Jr.
		Diana R. Harrington
		Susan M. Heilbron
		Susan B. Kerley
		Alan G. Merten
		R. Richardson Pettit
	b)	Not applicable.
ITEM 6.	SCHEDULE OF INVESTMENTS.
	Included herein under Item 1.

ITEM 7.	DISCLOSURE OF PROXY VOTING POLICIES AND PROCEDURES FOR CLOSED-END MANAGEMENT INVESTMENT COMPANIES.
	Not applicable.
ITEM 8.	PORTFOLIO MANAGERS OF CLOSED-END MANAGEMENT INVESTMENT COMPANIES.
	Not applicable.
ITEM 9.	PURCHASES OF EQUITY SECURITIES BY CLOSED-END MANAGEMENT INVESTMENT COMPANY AND AFFILIATED PURCHASERS.
	Not applicable.
ITEM 10.	SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS.
	Not applicable.
ITEM 11.	CONTROLS AND PROCEDURES.
	(a)	The registrant’s principal executive officer and principal financial officer have concluded that the registrant’s disclosure controls and procedures (as defined in Rule 30a- 3(c) under the Investment Company Act of 1940, as amended (the “1940 Act”)) are effective as of a date within 90 days of the filing date of this report that includes the disclosure required by this paragraph, based on their evaluation of the disclosure controls and procedures required by Rule 30a-3(b) under the 1940 Act and 15d-15(b) under the Securities Exchange Act of 1934.
	(b)	There were no changes in the registrant’s internal control over financial reporting (as defined in Rule 30a-3(d) under the 1940 Act) that occurred during the registrant’s last fiscal half-year (the registrant’s second fiscal half-year in the case of an annual report) that have materially affected, or are likely to materially affect the registrant’s internal control over financial reporting.
ITEM 12.	EXHIBITS.
	(a)(1) Code of Ethics attached hereto.
	Exhibit 99.CODE ETH
	(a)(2) Certifications pursuant to section 302 of the Sarbanes-Oxley Act of 2002 attached hereto.
	Exhibit 99.CERT
	(b) Certifications pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 attached hereto.
	Exhibit 99.906CERT

SIGNATURES

          Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, the registrant has duly caused this Report to be signed on its behalf by the undersigned, there unto duly authorized.

Legg Mason Partners Premium Money Market Trust
By:	/s/ R. Jay Gerken
	R. Jay Gerken
	Chief Executive Officer of
	Legg Mason Partners Premium Money Market Trust
Date: November 07, 2008

          Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.

By:	/s/ R. Jay Gerken
	R. Jay Gerken
	Chief Executive Officer of
	Legg Mason Partners Premium Money Market Trust
Date: November 07, 2008
By:	/s/ Frances M. Guggino
	Frances M. Guggino
	Chief Financial Officer of
	Legg Mason Partners Premium Money Market Trust
Date: November 07, 2008

EX-99.CODE ETH

I.      Covered Officers/Purpose of the Code

This code of ethics (the “Code”) for Legg Mason Partners Funds (“Funds” and each a, “Company”) applies to each Company’s Chief Executive Officer, Chief Administrative Officer, Chief Financial Officer and Controller (the “Covered Officers”¹) for the purpose of promoting:

• honest and ethical conduct, including the ethical handling of actual or apparent conflicts of interest between personal and professional relationships;

• full, fair, accurate, timely and understandable disclosure in reports and documents that the Company files with, or submits to, the Securities and Exchange Commission (“SEC”) and in other public communications made by the Company;

• compliance with applicable laws and governmental rules and regulations;

• the prompt internal reporting of violations of the Code to an appropriate person or persons identified in the Code; and

• accountability for adherence to the Code.

Each Covered Officer should adhere to a high standard of business ethics and should be sensitive to situations that may give rise to actual as well as apparent conflicts of interest.

II.      Administration of Code

 The Funds’ CCO is responsible for administration of this Code, including granting pre-approvals (see Section III below) and waivers (as described in Section VI below), applying this Code in specific situations in which questions are presented under it and interpreting this Code in any particular situation.

III.      Covered Officers Should Ethically Handle Actual and Apparent Conflicts of Interest

Overview.   A “conflict of interest” occurs when a Covered Officer’s private interest interferes with the interests of, or his service to, the Company. For example, a conflict of interest would arise if a Covered Officer, or a member of his family, receives improper personal benefits as a result of his position with the Company.

Certain conflicts of interest arise out of the relationships between Covered Officers and the Company and already are subject to conflict of interest provisions in the Investment Company Act of 1940 (“Investment Company Act”) and the Investment Advisers Act of 1940 (“Investment Advisers Act”). For example, Covered Officers may not individually engage in certain transactions (such as the purchase or sale of securities or other property) with the Company because of their status as “affiliated

_________________________

¹ Including persons performing similar functions.

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persons” of the Company. The compliance programs and procedures of the Company and its investment adviser are designed to prevent, or identify and correct, violations of these provisions. This Code does not, and is not intended to, repeat or replace these programs and procedures, and such conflicts fall outside of the parameters of this Code (see Section VII below).

Although typically not presenting an opportunity for improper personal benefit, conflicts arise from, or as a result of, the contractual relationship between a Company and the investment adviser of which the Covered Officers are also officers or employees. As a result, this Code recognizes that the Covered Officers will, in the normal course of their duties (whether formally for a Company or for the adviser, or for both), be involved in establishing policies and implementing decisions that will have different effects on the adviser and a Company. The participation of the Covered Officers in such activities is inherent in the contractual relationship between the Company and the adviser and is consistent with the performance by the Covered Officers of their duties as officers of a Company. Thus, if performed in conformity with the provisions of the Investment Company Act and the Investment Advisers Act, such activities will be deemed to have been handled ethically. In addition, it is recognized by the Funds’ Boards of Directors\Trustees (“Boards”) that the Covered Officers may also be officers or employees of one or more other investment companies covered by this or other codes.

Other conflicts of interest are covered by the Code, even if such conflicts of interest are not subject to provisions in the Investment Company Act and the Investment Advisers Act. The following list provides examples of conflicts of interest under the Code, but Covered Officers should keep in mind that these examples are not exhaustive. The overarching principle is that the personal interest of a Covered Officer should not be placed improperly before the interest of the Company.

Each Covered Officer must:

• not use his personal influence or personal relationships improperly to influence investment decisions or financial reporting (e.g. through fraudulent accounting practices) by the Company whereby the Covered Officer² would benefit personally to the detriment of the Company;

• not cause the Company to take action, or fail to take action, for the individual personal benefit of the Covered Officer rather than for the benefit of the Company; and

• not use material non-public knowledge of portfolio transactions made or contemplated for the Company to trade personally or cause others to trade personally in contemplation of the market affect of such transactions.

_________________________

² Any activity or relationship that would present a conflict for a Covered Officer would also present a conflict for the Covered Officer if a member of a Covered Officer’s family (spouse, minor children and any account over which a Covered Officer is deemed to have beneficial interest) engages in such an activity or has such a relationship.

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There are some potential conflict of interest situations that should always be discussed with the CCO, if material. Examples are as follows:

(1) service as a director on the board of any public or private company;
(2) any ownership interest in, or any consulting or employment relationship with, any of the Company’s service providers, other than its investment adviser;
(3) a direct or indirect financial interest in commissions, transaction charges or spreads paid by the Company for effecting portfolio transactions or for selling or redeeming shares other than an interest arising from the Covered Officer’s employment, such as compensation or equity ownership; and
(4) the receipt of any gifts or the conveyance of any value (including entertainment ) from any company with which the Company has current or prospective business dealings, except:
	(a) any non-cash gifts of nominal value (nominal value is less than $100); and
	(b) customary and reasonable meals and entertainment at which the giver is present, such as the occasional business meal or sporting event.

IV.      Disclosure and Compliance

Each Covered Officer:

• should be familiar with his or her responsibilities in connection with the disclosure requirements generally applicable to the Company;

• should not knowingly misrepresent, or knowingly cause others to misrepresent, facts about the Company to others, whether within or outside the Company, including to the Company’s directors and auditors, and to governmental regulators and self-regulatory organizations;

• should, to the extent appropriate within his or her area of responsibility, consult with other officers and employees of the Funds and the investment adviser with the goal of promoting full, fair, accurate, timely and understandable disclosure in the reports and documents the Funds file with, or submit to, the SEC and in other public communications made by the Funds; and

• is responsible to promote compliance with the standards and restrictions imposed by applicable laws, rules and regulations.

V.      Reporting and Accountability

Each Covered Officer must:

• upon adoption of the Code (or thereafter as applicable, upon becoming a Covered Officer), affirm in writing to the Board that the Covered Officer has received, read, and understands the Code;

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• annually thereafter affirm to the Board that he or she has complied with the requirements of the Code;

• annually disclose affiliations and other relationships related to conflicts of interest;

• not retaliate against any other Covered Officer or any employee of the Funds or their affiliated persons for reports of potential violations that are made in good faith; and

• notify the CCO promptly if he knows of any violation of this Code (failure to do so is itself a violation of this Code).

In rendering decisions and interpretations and in conducting investigations of potential violations under the Code, the CCO may, at his discretion, consult with such persons as he determines to be appropriate, including, but not limited to, a senior legal officer of the Company or its investment adviser or its affiliates, independent auditors or other consultants, subject to any requirement to seek pre-approval from the Company’s audit committee for the retention of independent auditors to perform permissible non-audit services. The Funds will follow these procedures in investigating and enforcing the Code:

• the CCO will take all appropriate action to investigate any potential violation of which he becomes aware;

• if, after investigation the CCO believes that no violation has occurred, the CCO is not required to take any further action;

• any matter that the CCO believes is a violation will be reported to the Directors of the Fund who are not “interested persons” as defined in the Investment Company Act the (“Non-interested Directors”)

• if the Non-interested Directors of the Board concur that a violation has occurred, it will consider appropriate action, which may include review of, and appropriate modifications to, applicable policies and procedures; notification to appropriate personnel of the investment adviser or its board; or a recommendation to dismiss the Covered Officer; and

• any changes to or waivers of this Code will, to the extent required, be disclosed as provided by SEC rules.

The CCO shall submit an annual report to the Board describing any waivers granted.

VI.      Waivers³

  A Covered Officer may request a waiver of any of the provisions of the Code by submitting a written request for such waiver to the CCO, setting forth the basis of such request and explaining how the waiver would be consistent with the standards of

_________________________

³ For purposes of this Code, Item 2 of Form N-CSR defines “waiver” as “the approval by a Company of a material departure from a provision of the Code” and includes an “implicit waiver,” which means a Company’s failure to take action within a reasonable period of time regarding a material departure from a provision of the Code that has been made known to an executive officer of the Company.

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conduct described herein. The CCO shall review such request and make a determination thereon in writing, which shall be binding.

In determining whether to waive any provisions of this Code, the CCO shall consider whether the proposed waiver is consistent with honest and ethical conduct and other purposes of this Code.

VII.      Other Policies and Procedures

This Code shall be the sole code of ethics adopted by the Funds for purposes of Section 406 of the Sarbanes-Oxley Act and the rules and forms applicable to registered investment companies thereunder. Insofar as other policies or procedures of the Funds, the Funds’ investment advisers, principal underwriters, or other service providers govern or purport to govern the behavior or activities of the Covered Officers who are subject to this Code, they are superseded by this Code to the extent that they overlap or conflict with the provisions of this Code. The codes of ethics of the funds and the investment advisers and principal underwriters under Rule 17j-1 of the Investment Company Act and the Legg Mason Code of Conduct as well as other policies of the Fund’s investment advisers or their affiliates are separate requirements applying to the Covered Officers and others, and are not part of this Code.

VIII.      Amendments

Any amendments to this Code must be approved or ratified by a majority vote of the Board, including a majority of Non-interested Directors.

IX.      Confidentiality

All reports and records prepared or maintained pursuant to this Code will be considered confidential and shall be maintained and protected accordingly. Except as otherwise required by law or this Code, such matters shall not be disclosed to anyone other than the appropriate Board and Company and their respective counsel, counsel to the non-Interested Directors or independent auditors or other consultants referred to in Section V above.

X.      Internal Use

The Code is intended solely for the internal use by the Funds and does not constitute an admission, by or on behalf of any Company, as to any fact, circumstance, or legal conclusion.

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EX-99.CERT

CERTIFICATIONS PURSUANT TO SECTION 302

EX-99.CERT

CERTIFICATIONS

I, R. Jay Gerken, certify that:

1.	I have reviewed this report on Form N-CSR of Legg Mason Partners Premium Money Market Trust– Citi Premium U.S. Treasury Reserves;
2.	Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;
3.	Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations, changes in net assets, and cash flows (if the financial statements are required to include a statement of cash flows) of the registrant as of, and for, the periods presented in this report;
4.	The registrant’s other certifying officers and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Rule 30a-3(c) under the Investment Company Act of 1940) and internal control over financial reporting (as defined in Rule 30a-3(d) under the Investment Company Act of 1940) for the registrant and have:
	a)	Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;
	b)	Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;
	c)	Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of a date within 90 days prior to the filing date of this report based on such evaluation; and
	d)	Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal half-year (the registrant’s second fiscal half-year in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and
5.	The registrant’s other certifying officers and I have disclosed to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):
	a)	All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize, and report financial information; and
	b)	Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:	November 07, 2008	/s/ R. Jay Gerken
		R. Jay Gerken
		Chief Executive Officer

I, Frances M. Guggino, certify that:

1.	I have reviewed this report on Form N-CSR of Legg Mason Partners Premium Money Market Trust– Citi Premium U.S. Treasury Reserves;
2.	Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;
3.	Based on my knowledge, the financial information included in this report, and the financial statements on which the financial information is based, fairly present in all material respects the financial condition, results of operations, changes in net assets, and cash flows (if the financial statements are required to include a statement of cash flows) of the registrant as of, and for, the periods presented in this report;
4.	The registrant’s other certifying officers and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Rule 30a-3(c) under the Investment Company Act of 1940) and internal control over financial reporting (as defined in Rule 30a-3(d) under the Investment Company Act of 1940) for the registrant and have:
	a)	Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;
	b)	Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;
	c)	Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of a date within 90 days prior to the filing date of this report based on such evaluation; and
	d)	Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal half-year (the registrant’s second fiscal half-year in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and
5.	The registrant’s other certifying officers and I have disclosed to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):
	a)	All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize, and report financial information; and
	b)	Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:	November 07, 2008	/s/ Frances M. Guggino
		Frances M. Guggino
		Chief Financial Officer

EX-99.906CERT

CERTIFICATIONS PURSUANT TO SECTION 906

EX-99.906CERT

CERTIFICATION

R. Jay Gerken, Chief Executive Officer, and Frances M. Guggino, Chief Financial Officer of Legg Mason Partners Premium Money Market Trust– Citi Premium U.S. Treasury Reserves (the “Registrant”), each certify to the best of his knowledge that:

     1. The Registrant’s periodic report on Form N-CSR for the period ended August 31, 2008 (the “Form N-CSR”) fully complies with the requirements of section 15(d) of the Securities Exchange Act of 1934, as amended; and

     2. The information contained in the Form N-CSR fairly presents, in all material respects, the financial condition and results of operations of the Registrant.

Chief Executive Officer	Chief Financial Officer
Legg Mason Partners	Legg Mason Partners
Premium Money Market Trust–	Premium Money Market Trust–
Citi Premium U.S. Treasury Reserves	Citi Premium U.S. Treasury Reserves
/s/ R. Jay Gerken	/s/ Frances M. Guggino
R. Jay Gerken	Frances M. Guggino
Date: November 07, 2008	Date: November 07, 2008

This certification is being furnished to the Securities and Exchange Commission solely pursuant to 18 U.S.C. § 1350 and is not being filed as part of the Form N-CSR with the Commission.