Lady Gaga, Kelly Clarkson, LMFAO & More Hit Z100’s Jingle Ball (PHOTOS)

It must be the holidays — otherwise, how could we account for the gift of having so many of our favorite acts in one room? Z100’s Jingle Ball pulled out all the stops at Madison Square Garden last night, including a Kelly Clarkson and Demi Lovato duet and Lady Gaga singing “White Christmas” perched atop a motorcycle with sunglasses on (it’s true, a white Christmas can be very bright). In addition to these marvelous ladies, the bash featured Foster The People, Travie

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