Z100's Jingle Ball 2009 Presented by H&M - Backstage [Getty Images]

(EXCLUSIVE, Premium Rates Apply) NEW YORK - DECEMBER 11: *EXCLUSIVE* Taylor Swift and Justin Bieber attends Z100's Jingle Ball 2009 presented by H&M at Madison Square Garden on December 11, 2009 in New York City. (Photo by Kevin Mazur/WireImage for Clear Channel Radio New York)

WireImage Kevin Mazur