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| Singer Taylor Swift performs at the 2009 Z100 Jingle Ball at Madison Square Garden in New York on Friday, December 11, 2009. (AP/Evan Agostini) |
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| Singer Adam Lambert at the press room at the 2009 Z100 Jingle Ball concert at Madison Square Garden in New York. (AP/Peter Kramer) |
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| Orianthi attends Z100's Jingle Ball 2009 at Madison Square Garden on December 11, 2009 in New York City. Jason Kempi (AFP/Jason Kempin) |
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| Pittbull attends Z100's Jingle Ball 2009 at Madison Square Garden on December 11, 2009 in New York. (AFP/Jason Kempin) |
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| Taylor Swift performs onstage during Z100's Jingle Ball 2009 at Madison Square Garden on December 11, 2009 in New York. (AFP/Bryan Bedder) |
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| Taylor Swift performs onstage during Z100's Jingle Ball 2009 at Madison Square Garden on December 11, 2009 in New York. (AFP/Bryan Bedder) |
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| Actress Leighton Meester at the press room at the 2009 Z100 Jingle Ball concert at Madison Square Garden in New York, on Friday, December 11, 2009. (AP/Peter Kramer) |
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| Taylor Swift performs onstage during Z100's Jingle Ball 2009 at Madison Square Garden on December 11, 2009 in New York. (AFP/Bryan Bedder) |
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| Taylor Swift performs onstage during Z100's Jingle Ball 2009 at Madison Square Garden on December 11, 2009 in New York. (AFP/Bryan Bedder) |
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| Singer Taylor Swift performs at the 2009 Z100 Jingle Ball at Madison Square Garden in New York on Friday, December 11, 2009. (AP/Evan Agostini) |
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| Singer Taylor Swift performs at the 2009 Z100 Jingle Ball at Madison Square Garden in New York on Friday, December 11, 2009. (AP/Evan Agostini) |
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| Singer Jordin Sparks performs at the 2009 Z100 Jingle Ball at Madison Square Garden in New York on Friday, December 11, 2009. (AP/Evan Agostini) |
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| Musician John Mayer and singer Taylor Swift perform together at the 2009 Z100 Jingle Ball at Madison Square Garden in New York on Friday, December 11, 2009. (AP/Evan Agostini) |
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| Singer Justin Bieber performs with cast on leg at the 2009 Z100 Jingle Ball at Madison Square Garden in New York on Friday, December 11, 2009. (AP/Evan Agostini) |
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| Singer Jordin Sparks performs at the 2009 Z100 Jingle Ball at Madison Square Garden in New York on Friday, December 11, 2009. (AP/Evan Agostini) |
