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Kristen Stewart

NEW YORK, NY - DECEMBER 13: Actress Kristen Stewart attends "On The Road" New York Premiere at SVA Theater on December 13, 2012 in New York City. (Photo by Mike Coppola/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