Gallery: Z 100′s Jingle Ball Put Young Hollywood In A Festive Mood

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Surprise! Rosie O'Donnell was there in a sweatsuit.

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Justin Bieber with fake gf Kim Kardashian.

Oh, Paulie D, you always look the same.

Is Emily Osment wearing American Apparel?

Jesse McCartney looking so cute!

Hayley Williams' hair is already Christmas colored.

Bruno Mars in gray.

Surprise! Rosie O'Donnell was there in a sweatsuit.