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

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We want to go to something called a Jingle Ball! Especially if it means Katy Perry‘s in attendance dressed as a nutcracker. But, alas, we weren't invited because we're not as awesome as Justin Bieber and Selena Gomez. Though we're at least as cool as Rosie O'Donnell, right?