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| Singer Katy Perry performs at Z100 Jingle Ball 2008 at Madison Square Garden on December 12, 2008 in New York. (AP Photo/Evan Agostini) |
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| Singer Rihanna performs at Z100 Jingle Ball 2008 at Madison Square Garden on December 12, 2008 in New York. (AP Photo/Evan Agostini) |
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| Singer Leona Lewis performs at Z100 Jingle Ball 2008 at Madison Square Garden on December 12, 2008 in New York. (AP Photo/Evan Agostini) |
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| Actress and singer Ashley Tisdale addresses the crowd during the Z100 Jingle Ball in New York on December 12, 2008. (Reuters/Lucas Jackson) |
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| Singers Rihanna and Chris Brown perform at the Z100 Jingle Ball 2008 at Madison Square Garden on December 12, 2008 in New York. (AP Photo/Evan Agostini) |
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| Singer Chris Brown performs at Z100 Jingle Ball 2008 at Madison Square Garden on December 12, 2008 in New York. (AP Photo/Evan Agostini) |
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| Paramore singer Hayley Williams performs at Z100 Jingle Ball 2008 at Madison Square Garden on December 12, 2008 in New York. (AP Photo/Evan Agostini) |
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| Singer Katy Perry performs at Z100 Jingle Ball 2008 at Madison Square Garden on December 12, 2008 in New York. (AP Photo/Evan Agostini) |
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| Singer Jesse McCartney performs at Z100 Jingle Ball 2008 at Madison Square Garden on December 12, 2008 in New York. (AP Photo/Evan Agostini) |
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| Singer Brandy performs at Z100 Jingle Ball 2008 at Madison Square Garden on December 12, 2008 in New York. (AP Photo/Evan Agostini) |
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| Singer Leona Lewis poses in the press room at the Z100 Jingle Ball concert at Madison Square Garden in New York on December 12, 2008. (AP Photo/Peter Kramer) |
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| Singer Rihanna poses in the press room at the Z100 Jingle Ball concert at Madison Square Garden in New York on December 12, 2008. (AP Photo/Peter Kramer) |
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| Singer Lady GaGa poses in the press room at the Z100 Jingle Ball concert at Madison Square Garden in New York on December 12, 2008. (AP Photo/Peter Kramer) |
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| Singer Rihanna poses in the press room at the Z100 Jingle Ball concert at Madison Square Garden in New York on December 12, 2008. (AP Photo/Peter Kramer) |
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| Singer Katy Perry poses in the press room at the Z100 Jingle Ball concert at Madison Square Garden in New York on December 12, 2008. (AP Photo/Peter Kramer) |
