Chris Brown and Pitbull couldn't stop smiling as they performed 'Fun' on stage!

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Billboard Music Awards 2015: 27 MUST-SEE Pics Feat. Kanye West, Ed Sheeran & Nicki Minaj!

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See the full gallery: Billboard Music Awards 2015: 27 MUST-SEE Pics Feat. Kanye West, Ed Sheeran & Nicki Minaj!