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Nicole Kidman

MELBOURNE, AUSTRALIA - NOVEMBER 03: Nicole Kidman poses at the Swisse Marquee at Flemington Racecourse on November 3, 2012 in Melbourne, Australia. (Photo by Mark Metcalfe/Getty Images for the VRC)

What Were They Thinking?!

This week's worst-dressed crew includes Mischa Barton, Beyonce, and Britney. -- By Matt Whitfield, Yahoo! Staff