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Justin Bieber shakes hands with fans during his performance on the second night of KIIS FM's Jingle Ball at Nokia Theatre LA Live on Monday, Dec. 3, 2012, in Los Angeles. (Photo by Chris Pizzello/Invision/AP)

Ryan Seacrest, left, and singer Alicia Keys introduce Justin Bieber during the second night of KIIS FM's Jingle Ball at Nokia Theatre LA Live on Monday, Dec. 3, 2012, in Los Angeles. (Photo by Chris Pizzello/Invision/AP)

Pitbull makes a guest appearance during Afrojack's set on the second night of KIIS FM's Jingle Ball at Nokia Theatre LA Live on Monday, Dec. 3, 2012, in Los Angeles. (Photo by Chris Pizzello/Invision/AP)

Flo Rida wades into the audience during his performance on the second night of KIIS FM's Jingle Ball at Nokia Theatre LA Live on Monday, Dec. 3, 2012, in Los Angeles. (Photo by Chris Pizzello/Invision/AP)

Psy, center, performs during the second night of KIIS FM's Jingle Ball at Nokia Theatre LA Live on Monday, Dec. 3, 2012, in Los Angeles. (Photo by Chris Pizzello/Invision/AP)

Rapper Flo Rida and StayC perform onstage during KIIS FM's 2012 Jingle Ball at Nokia Theatre L.A. Live on December 3, 2012 in Los Angeles, California. (Photo by Christopher Polk/Getty Images for Clear Channel)

Singer Matthew Koma performs onstage during KIIS FM's 2012 Jingle Ball at Nokia Theatre L.A. Live on December 3, 2012 in Los Angeles, California. (Photo by Christopher Polk/Getty Images for Clear Channel)

Musician Adam Young of Owl City performs onstage during KIIS FM's 2012 Jingle Ball at Nokia Theatre L.A. Live on December 3, 2012 in Los Angeles, California. (Photo by Christopher Polk/Getty Images for Clear Channel)

Ke$ha, second from left, performs with backup dancers during the second night of KIIS FM's Jingle Ball at Nokia Theatre LA Live on Monday, Dec. 3, 2012, in Los Angeles. (Photo by Chris Pizzello/Invision/AP)

Singer Tom Parker of The Wanted performs onstage during KIIS FM's 2012 Jingle Ball at Nokia Theatre L.A. Live on December 3, 2012 in Los Angeles, California. (Photo by Christopher Polk/Getty Images for Clear Channel)

K$sha arrives at KIIS FM's Jingle Ball at Nokia Theatre LA Live on Monday, Dec. 3, 2012, in Los Angeles. (Photo by Katy Winn/Invision/AP)

Dancers perform onstage during KIIS FM's 2012 Jingle Ball at Nokia Theatre L.A. Live on December 3, 2012 in Los Angeles, California. (Photo by Christopher Polk/Getty Images for Clear Channel)

Singer Nathan Sykes of The Wanted performs onstage during KIIS FM's 2012 Jingle Ball at Nokia Theatre L.A. Live on December 3, 2012 in Los Angeles, California. (Photo by Christopher Polk/Getty Images for Clear Channel)

DJ Jenil Mashup performs onstage during KIIS FM's 2012 Jingle Ball at Nokia Theatre L.A. Live on December 3, 2012 in Los Angeles, California. (Photo by Christopher Polk/Getty Images for Clear Channel)

Singer Siva Kaneswaran of The Wanted performs onstage during KIIS FM's 2012 Jingle Ball at Nokia Theatre L.A. Live on December 3, 2012 in Los Angeles, California. (Photo by Christopher Polk/Getty Images for Clear Channel)

Singer Kesha performs onstage during KIIS FM's 2012 Jingle Ball at Nokia Theatre L.A. Live on December 3, 2012 in Los Angeles, California. (Photo by Christopher Polk/Getty Images for Clear Channel)

Singer Justin Bieber and musician Dan Kanter perform onstage during KIIS FM's 2012 Jingle Ball at Nokia Theatre L.A. Live on December 3, 2012 in Los Angeles, California. (Photo by Christopher Polk/Getty Images for Clear Channel)

Singer Kesha performs onstage during KIIS FM's 2012 Jingle Ball at Nokia Theatre L.A. Live on December 3, 2012 in Los Angeles, California. (Photo by Christopher Polk/Getty Images for Clear Channel)

Musician Jack Antonoff of Fun. performs onstage during KIIS FM's 2012 Jingle Ball at Nokia Theatre L.A. Live on December 3, 2012 in Los Angeles, California. (Photo by Christopher Polk/Getty Images for Clear Channel)

DJ Tay James performs onstage during KIIS FM's 2012 Jingle Ball at Nokia Theatre L.A. Live on December 3, 2012 in Los Angeles, California. (Photo by Christopher Polk/Getty Images for Clear Channel)

Singer Kesha (C) attends KIIS FM's 2012 Jingle Ball at Nokia Theatre L.A. Live on December 3, 2012 in Los Angeles, California. (Photo by Christopher Polk/Getty Images for Clear Channel)

Singer Alicia Keys attends KIIS FM's 2012 Jingle Ball at Nokia Theatre L.A. Live on December 3, 2012 in Los Angeles, California. (Photo by Imeh Akpanudosen/Getty Images)

Singer Jordin Sparks attends KIIS FM's 2012 Jingle Ball at Nokia Theatre L.A. Live on December 3, 2012 in Los Angeles, California. (Photo by Imeh Akpanudosen/Getty Images)

Actress/singer Ariana Grande attends KIIS FM's 2012 Jingle Ball at Nokia Theatre L.A. Live on December 3, 2012 in Los Angeles, California. (Photo by Imeh Akpanudosen/Getty Images)

Singers Jordin Sparks (L) and Jason Derulo attend KIIS FM's 2012 Jingle Ball at Nokia Theatre L.A. Live on December 3, 2012 in Los Angeles, California. (Photo by Imeh Akpanudosen/Getty Images)

Comedienne Kathy Griffin attends KIIS FM's 2012 Jingle Ball at Nokia Theatre L.A. Live on December 3, 2012 in Los Angeles, California. (Photo by Imeh Akpanudosen/Getty Images)

TV personalities Kendall Jenner (L) and Kylie Jenner attend KIIS FM's 2012 Jingle Ball at Nokia Theatre L.A. Live on December 3, 2012 in Los Angeles, California. (Photo by Imeh Akpanudosen/Getty Images)

TV personality Stephanie Pratt attends KIIS FM's 2012 Jingle Ball at Nokia Theatre L.A. Live on December 3, 2012 in Los Angeles, California. (Photo by Imeh Akpanudosen/Getty Images)

TV personality/actress NeNe Leakes attends KIIS FM's 2012 Jingle Ball at Nokia Theatre L.A. Live on December 3, 2012 in Los Angeles, California. (Photo by Imeh Akpanudosen/Getty Images)

Dancer Carrie Ann Inaba attends KIIS FM's 2012 Jingle Ball at Nokia Theatre L.A. Live on December 3, 2012 in Los Angeles, California. (Photo by Imeh Akpanudosen/Getty Images)

Actor James Van Der Beek attends KIIS FM's 2012 Jingle Ball at Nokia Theatre L.A. Live on December 3, 2012 in Los Angeles, California. (Photo by Imeh Akpanudosen/Getty Images)

DJ Zedd, singer Louisa Rose Allen aka Foxes, and singer Matthew Koma attend KIIS FM's 2012 Jingle Ball at Nokia Theatre L.A. Live on December 3, 2012 in Los Angeles, California. (Photo by Imeh Akpanudosen/Getty Images)

Singer/songwriter BC Jean attends KIIS FM's 2012 Jingle Ball at Nokia Theatre L.A. Live on December 3, 2012 in Los Angeles, California. (Photo by Imeh Akpanudosen/Getty Images)

Actor Roshon Fegan attends KIIS FM's 2012 Jingle Ball at Nokia Theatre L.A. Live on December 3, 2012 in Los Angeles, California. (Photo by Imeh Akpanudosen/Getty Images)

TV personality Chris Harrison and his kids attend KIIS FM's 2012 Jingle Ball at Nokia Theatre L.A. Live on December 3, 2012 in Los Angeles, California. (Photo by Imeh Akpanudosen/Getty Images)

Psy arrives at KIIS FM's Jingle Ball at Nokia Theatre LA Live on Monday, Dec. 3, 2012, in Los Angeles. (Photo by Katy Winn/Invision/AP)