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NEW YORK - DECEMBER 11: John Mayer and Taylor Swift perform onstage during Z100's Jingle Ball 2009 presented by H&M at Madison Square Garden on December 11, 2009 in New York City. (Photo by Theo Wargo/WireImage for Clear Channel Radio New York)

NEW YORK - DECEMBER 11:  John Mayer and Taylor Swift perform onstage during Z100's Jingle Ball 2009 presented by H&M at Madison Square Garden on December 11, 2009 in New York City.  (Photo by Theo Wargo/WireImage for Clear Channel Radio New York)