At Z100's Jingle Ball 2011 Official Kick-Off Party in NYC, the star-studded line-up was announced for the radio station's annual holiday concert, including a special performance by Demi Lovato.

Other performers include Lady Gaga, Pitbull, LMFAO, Kelly Clarkson, and Foster the People, while special guest hosts will be Kim and Khloé Kardashian Odom, along with Lamar Odom and Karmin.

Lovato took the stage at the kick-off party singing some of her hit singles. Watch!

Z100's Jingle Ball 2011 will take place at Madison Square Garden on Friday, December 9 at 7:30pm. The official charity partner of this year's concert is Stomp Out Bullying, a national anti-bullying/cyberbullying program for kids and teens.

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