EXHIBIT 99.302


I, Jonathan S. Thomas, certify that:


1.       I have  reviewed  this report on Form N-CSR of American  Century  Asset
         Allocation Portfolios, 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 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  officer 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 second fiscal quarter of the period covered by this 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  officer 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: March 31, 2009


/s/  Jonathan S. Thomas
------------------------------------
Jonathan S. Thomas
President
(principal executive officer)






I, Robert J. Leach, certify that:


1.       I have  reviewed  this report on Form N-CSR of American  Century  Asset
         Allocation Portfolios, 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 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  officer 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 second fiscal quarter of the period covered by this 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  officer 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: March 31, 2009


/s/  Robert J. Leach
------------------------------------
Robert J. Leach
Vice President, Treasurer, and
Chief Financial Officer
(principal financial officer)