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Former U.S. President Bill Clinton shakes hands with singer Usher Raymond at the Clinton Global Initiative, in New York, September 24, 2009. About 1,200 participants including heads of state, business leaders, humanitarians and celebrities will attend the fifth annual Clinton Global Initiative (CGI) which started on Tuesday. (REUTERS/Chip East)

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.