Ke$ha, second from left, performs with backup dancers during the second night of KIIS FM's Jingle Ball at Nokia Theatre LA Live on Monday, Dec. 3, 2012, in Los Angeles. (Photo by Chris Pizzello/Invision/AP)
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Ke$ha, second from left, performs with backup dancers during the second night of KIIS FM's Jingle Ball at Nokia Theatre LA Live on Monday, Dec. 3, 2012, in Los Angeles. (Photo by Chris Pizzello/Invision/AP)
