The man who discovered Justin Bieber, Scooter Braun, celebrated his 30th birthday with an array of famous friends on Saturday night in LA. Braun was toasted by Bieber, Usher, Mary J Blige, Adam Levine, Kim Kardashian, Nicky and Paris Hilton, Wilmer Valderrama, Rita Wilson, who came with son Jack, plus music power brokers Steve Bartels, Jimmy Iovine and Guy Oseary. Bieber performed his hits “Baby” and “Never Say Never” (which he performed with Jaden Smith, son of Will Smith for the star-studded room. Bieber introduced MC Hammer as his birthday present to Braun, and Hammer performed his hits including “Too Legit To Quit.” The party of an intimate 500 continued all night long with additional impromptu performances by Usher, Levine and Asher Roth.