Item 3.
CERTIFICATIONS
I, Edward C. Bernard, certify that:
1.	I have reviewed this report on Form N-Q of T. Rowe Price Blue Chip Growth Fund, Inc.;
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 schedules of investments included in this report fairly present in all
	material respects the investments of the registrant as of the end of the fiscal quarter for which the
	report is filed;
4.	The registrant's other certifying officer(s) 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 quarter 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 officer(s) 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: May 19, 2006			/s/ Edward C. Bernard
			Edward C. Bernard
			Principal Executive Officer

CERTIFICATIONS
I, Joseph A. Carrier, certify that:
1.	I have reviewed this report on Form N-Q of T. Rowe Price Blue Chip Growth Fund, Inc.;
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 schedules of investments included in this report fairly present in all
	material respects the investments of the registrant as of the end of the fiscal quarter for which the
	report is filed;
4.	The registrant's other certifying officer(s) 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 quarter 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 officer(s) 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: May 19, 2006			/s/ Joseph A. Carrier
			Joseph A. Carrier
			Principal Financial Officer