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Microsoft Chairman and former CEO Bill Gates, left, and former President Bill Clinton, right, shake hands before having a discussion on the subject of giving during the Clinton Global Initiative annual meeting Wednesday, Sept. 24, 2008 in New York. (AP Photo/Jason DeCrow)

Bill Clinton's celebrity circle

Former President Bill Clinton has acquired a stellar list of famous friends over the course of his presidency and recent work with the William J. Clinton Foundation. He will be joined by several of these A-list pals at "A Decade Of Difference: A Concert Celebrating 10 Years Of The William J. Clinton Foundation" on October 15.