Jingle Ball 2009

Taylor Swift, Justin Bieber and John Mayer helped raise the roof at Z100's Jingle Ball 2009 concert at Madison Square Garden.

26 photos
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Justin Bieber rocks the boot during Z100's Jingle Ball 2009 at Madison Square Garden.
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John Mayer isn't afraid to play in smaller venues, but he looks like he's having a good time at MSG.
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Go Orianthi, Go Orianthi, Go Orianthi.
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Leighton Meester didn't perform on stage, but she hung out at the pre-show. We're happy.
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DOT
Rock the hair, Taylor Swift! Don't worry, Kanye's not watching.
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But just in case he is, John Mayer's there to protect you.
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Ke$ha looks hot in her leotard.
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American Idol Kris Allen wows the crowd.
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We can't see your eyes behind your hair, but we know they're there.
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Singer Adam Lambert didn't get on stage, or at least we didn't see photos (maybe that's because Z100 was trying to avoid another AMA moment).
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Z100 radio personality Elvis Duran smooches Allison Iraheta onstage.
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Watch those legs, Ke$ha!
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Jordin Sparks lights it up.
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Isaac Slade of The Fray hushes someone offstage so he can finish his performance.
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Raise the roof, Jordin!
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Can't go wrong with the two J's.
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Pitbull looks kinda like ... a ... umm ...
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Hey dude, off the piano. Oh, it's you, Isaac. OK.
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Musician Martin Johnson of Boys Like Girls attends Z100's Jingle Ball 2009 at Madison Square Garden.
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NBCConnecticut.com
(L-R) John Keefe, Martin Johnson, Paul DiGiovanni and Bryan Donahue of Boys Like Girls also performed during the MACY's Thanksgiving Day Parade.
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Allison Iraheta didn't win "Idol," but we're big fans anyway.
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Martin Johnson of Boys Like Girls perform onstage with Taylor Swift.
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NEW YORK - DECEMBER 11: Martin Johnson of Boys Like Girls performs onstage with Taylor Swift during Z100's Jingle Ball 2009 at Madison Square Garden on December 11, 2009 in New York City. (Photo by Bryan Bedder/Getty Images)
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Radio personality Carolina Bermudez didn't perform, but she looks nice in her purple dress.
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Kelly Bensimon shows up everywhere.
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Jay Sean got into his performance.
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