Fannie Mae and Freddie Mac Transparency Act of 2011 - Amends the Federal National Mortgage Association Charter Act and the Federal Home Loan Mortgage Corporation Act to provide that, during any period in which either the Federal National Mortgage Association (Fannie Mae) or the Federal Home Loan Mortgage Corporation (Freddie Mac) is under conservatorship or receivership, it shall be considered an agency subject to the public information disclosure requirements of the Freedom of Information Act.