Justin Bieber & Usher Rock Out At Manager's Birthday Party

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Jun. 19 2011, Updated 4:15 a.m. ET

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By Amber Goodhand

Radar Staff Reporter

It pays to be on Justin Bieber's team.

Bieber's manager, Scooter Braun, threw a 30th birthday bash in Hollywood on Saturday night and RadarOnline.com got exclusive video and photos of the party.

Usher and Bieber gave a duet performance to Yeah! while Bieber banged away on the drums and then the two introduced surprise guest and 90's legend, MC Hammer.

The party's carnival theme featured contortionists, tarot card readers, fire throwers, a beer pong tournament and pole dancers.

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Speaking of beer pong, Bieber and Will Smith's son Jaden competed in a PG version of the popular college drinking game.

Also spotted at The Music Box party were Kim Kardashian, Paris Hilton, Nicky Hilton and Rita Wilson.

Just when guests thought the performances were over, Maroon 5's Adam Levine jumped from the crowd to sing their hit This Love.

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