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NEW YORK, NY - DECEMBER 17: Musician John Mayer leaves the "Good Morning America" taping at the ABC Times Square Studios on December 17, 2013 in New York City. (Photo by Ray Tamarra/Getty Images)

What Were They Thinking?! (week of 12/16/13)

John Mayer, Justin Bieber, and Kristen Wiig deliver this week's biggest fashion flubs.