SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

Filed by the Registrant x  Filed by a Party other than the Registrant ¨

Check the appropriate box:

¨ Preliminary Proxy Statement.

¨ Confidential, for use of the Commission Only (as permitted by Rule 14a-6(e)(2)).

¨ Definitive Proxy Statement.

x  Definitive Additional Materials.

¨ Soliciting Material Pursuant to sec. 240.14a-12.

Western Asset Municipal Partners Fund Inc.

Western Asset Municipal Partners Fund II Inc.

(Name of Registrant as Specified in its Charter)

(Name of Person(s) Filing Proxy Statement, if Other Than the Registrant)

Payment Of Filing Fee (Check the appropriate box):

x  No fee required.

¨ Fee computed on table below per Exchange Act Rules 14a-6(i)(1) and 0-11.

1)  Title of each class of securities to which transaction applies:

2)  Aggregate number of securities to which transaction applies:

3)  Per unit price or other underlying value of transaction computed pursuant to Exchange Act Rule 0-11 (set forth the amount on which the filing fee is calculated and state how it was determined):

4)  Proposed maximum aggregate value of transaction:

5)  Total fee paid:

¨ Fee paid previously with preliminary materials.

¨ Check box if any part of the fee is offset as provided by Exchange Act Rule 0-11(a)(2) and identify the filing for which the offsetting fee was paid previously. Identify the previous filing by registration statement number, or the form or schedule and the date of its filing.

1)  Amount Previously Paid:

2)  Form, Schedule or Registration Statement No.:

3)  Filing Party:

4)  Date Filed:

Western Asset Municipal Partners Fund Inc.

Western Asset Municipal Partners Fund II Inc.

Important Proxy

News

PLEASE SUBMIT YOUR VOTING INSTRUCTIONS TODAY!

Dear Shareholder:

Recently, we distributed proxy materials regarding the Special Meeting of Shareholders scheduled for June 15, 2007 at 2:30 p.m. Eastern time. To date, our records indicate that we have not received your voting instructions.

After careful consideration, the Boards of Directors of both Funds recommend that shareholders vote “FOR” the proposals. Your vote is important no matter how many shares you own. We urge you to act promptly in order to allow us to obtain a sufficient number of votes and avoid the cost of additional solicitation.

If you should have any questions regarding the proposals, or require duplicate proxy materials, please contact Computershare Fund Services at 1-866-525-2502. Representatives are available Monday through Friday between the hours of 9:00 a.m. and 11:00 p.m. and Saturday from 12:00 p.m. to 6:00 p.m. Eastern time.

The proxy materials are available by visiting the Funds’ website at www.leggmason.com then click on Mutual Fund Resources—Proxy Voting Information.

For your convenience, please utilize any of the following methods to submit your voting instructions:

1. By Internet.

Visit www.proxyvote.comand follow the simple on-screen instructions.

2. By Touch-Tone Phone.

Dial the toll-free number found on your proxy card and follow the simple instructions.

3. By Mail.

Simply execute and return the enclosed proxy card in the envelope provided. However, please try to utilize one of the two options above to register your voting instructions, so they may be received in time for the meeting.

If you have already submitted voting instructions by utilizing one of these methods, then you do not need to take any action.

WE NEED YOUR HELP. PLEASE SUBMIT YOUR VOTING INSTRUCTIONS TODAY!

THANK YOU FOR INVESTING WITH LEGG MASON.