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Justin Bieber, Scooter Braun

Courtesy of Wireimage

Scooter Braun is one popular dude.

In case you don't know, he's Justin Bieber's manager, and his 30th birthday party this weekend brought out a slew of stars and surprise performers.

On the list for his L.A. birthday extravaganza besides the Biebs was Kim Kardashian, Paris Hilton, Adam Levine, Jaden Smith and Wilmer Valderama. Usher and MC Hammer performed, as did Justin, natch.

A-listers who couldn't attend the bash at the Music Box, including Diddy and Will Smith, sent their well wishes via video.

Justin's girlfriend, Selena Gomez, was MIA from his manager's party, but she had a good excuse...

She was in Canada, preparing to host the MuchMusic Awards (where Justin would join her the next day).

But on Saturday Justin was in full party mode, even playing beer pong against the birthday boy as 12-year-old Jaden reportedly watched on.

Don't worry, he was using water instead of alcohol.

An epic time was had by guests of all ages, according to Twitter.

"crazy! @mchammer @usherraymondiv @adamlevine @thedanband @asherroth killed it. crazY! me & @officialjaden went in! @scooterbraun happy bday!" Justin tweeted.

"WE ARE HAVING THE GREATEST NIGHT EVER!!!! HAPPY BIRTHDAY SCOOTER!!!!" Usher added.

Indeed.