Exciting moments at Jingle Ball 2009 in NY

Singer Justin Bieber (C) performs during the Z100 Jingle Ball in New York December 11, 2009.

Singer Taylor Swift (R) performs with John Mayer during the Z100 Jingle Ball in New York December 11, 2009.

Singer Jordin Sparks performs during the Z100 Jingle Ball in New York December 11, 2009.

Singer Usher (L) performs with Justin Bieber during the Z100 Jingle Ball in New York December 11, 2009.

Singer Isaac Slade of the band "The Fray" performs during the Z100 Jingle Ball in New York December 11, 2009.

Taylor Swift performs at KIIS FM's Jingle Ball 2009 in Los Angeles December 5, 2009.

Actor Peter Facinelli introduces an act during the Z100 Jingle Ball in New York December 11, 2009.

Singer Pitbull performs during the Z100 Jingle Ball in New York December 11, 2009.

Singer John Mayer performs during the Z100 Jingle Ball in New York December 11, 2009.

Actress Leighton Meester introduces an act during the Z100 Jingle Ball in New York December 11, 2009.
(Reuters)