Justin Bieber, Usher Throw Scooter Braun A Birthday Bash

Justin Bieber and Scooter Braun

Justin Bieber, Usher and Maroon 5 singer Adam Levine came out to party together on Saturday night. And just what occasion were they celebrating? Well, they were all on hand as Bieber's manager, Scooter Braun, celebrated turning the big 3-0. The par-tay took place in Los Angeles, where Braun was roasted by his pals, including the night's MC, Usher.

Other attendees included Asher Roth, Kim Kardashian, Mary J Blige, Paris and Nicky Hilton, Jaden Smith, Wilmer Valderrama and Rita Wilson. Those who couldn't make the party but recorded well-wishes for the music mogul included Will Smith, Diddy, Ludacris and Keri Hilson.

Not only was there food and revelry, but there were also some A-list performances from The Dan Band, Usher and, yes, Bieber, who played drums and performed "Baby," as well as "Never Say Never" with Jaden.

But who turned up for the night's big surprise?

Perhaps the most surprising performance came from the one and only MC Hammer, who got on stage for "2 Legit 2 Quit." As one reveler pointed out, via a retweet from Biebs, "Only @scooterbraun would have MC Hammer perform at his Birthday party. This is soooo awesome!"

So was Scooter grateful for the good time? You bet! He tweeted, "won't ever forget last night. incredible childhood friends came out. was just a great night. EPIC is the only word 2 describe it. WE GOT DOWN."