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Singer Taylor Swift performs at Z100's Jingle Ball 2012 presented by Aeropostale at Madison Square Garden on Friday Dec. 7, 2012 in New York. (Photo by Evan Agostini/Invision/AP)

Singer Taylor Swift performs at Z100's Jingle Ball 2012 presented by Aeropostale at Madison Square Garden on Friday Dec. 7, 2012 in New York. (Photo by Evan Agostini/Invision/AP)