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Kate Winslet

HONG KONG - DECEMBER 09: Actress Kate Winslet (guest of Longines) smiles during The presentation of The Longines Hong Kong Cup during the Hong Kong International Races at Sha Tin racecourse on December 9, 2012 in Hong Kong. (Photo by Vince Caligiuri/Getty Images)

What Were They Thinking?!

This week's worst-dressed crew includes Katy Perry, Kristen Stewart, and Kim Kardashian. -- By Matt Whitfield, Yahoo! Staff