Lady Gaga & Kelly Clarkson: Z100 Jingle Ball Performers!

The lineup for Z100‘s 2011 Jingle Ball has been revealed!

Lady Gaga, Kelly Clarkson, Demi Lovato, and LMFAO will be hitting the stage at NYC’s Madison Square Garden on Friday, December 9.

Pitbull, Foster the People, Gym Class Heroes, David Guetta, and Hot Chelle Rae will also be performing.

Tickets for ZVIPs will go on sale Tuesday, November 1, at 4 p.m., before they’re available to the public on November 2 at 4 p.m. – you can also win tickets just by listening to Z100!

For more info on 2011 Jingle Ball, check out Z100.com!

Also pictured inside: Demi performing at Z100′s Jingle Ball 2011 official kick off party at Aeropostale Times Square.

30+ pictures inside of Demi hitting the stage at the big kick off event…