Bieber, Ke$ha at KIIS-FM's 'Jingle Ball'

The hottest ticket in town was for the second night of KIIS-FM's "Jingle Ball" at the Nokia Theatre LA Live in Los Angeles.

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)

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)

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