Plus: Jennifer Lopez sizzles in her latest Vogue spread, Pitbull goes 'Back in Time,' Justin Bieber gets stylish for GQ, and more!
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Brokenhearted
FUN.
The Wanted
Flo Rida
Katy Perry
Gotye
One Direction
Calvin Harris
Kelly Clarkson
Carly Rae Jepsen
David Guetta