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Michelle Obama, Barack Obama

CHICAGO, IL - NOVEMBER 06: U.S. President Barack Obama stands on stage with first lady Michelle Obama after his victory speech on election night at McCormick Place on November 6, 2012 in Chicago, Illinois. (Photo by Lyle A. Waisman/WireImage)

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January 1, 1970

This week's best-dressed crew includes Nicole Richie, Cameron Diaz, and Kristen Stewart. -- By Matt Whitfield, Yahoo! Staff

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