Justin Bieber was in the Bday party supporting his manager, Scooter Braun, spending much of the night playing beer pong (with water!) against his best buddy Jaden Smith. But it was easy for him to get distracted by all the extravagance. The party was wild, with fire throwers and belly dancers.

Kim Kardashian, Adam Levine, Paris Hilton & Usher were there too.

According to Hollywoodlife, Justin kicked things off by singing “Never Say Never” with a rap by Jaden, who also took over the Ludacris part in “Baby.” Then MC Hammer somewhat randomly ran through some hits, including “Too Legit To Quit.” Usher kept the party going by performing a set filled with hits like “Yeah!”, and although he was shy to get onstage, Adam Levine even belted out Maroon 5′s smash “This Love.”

Meanwhile, Kim Kardashian was mingling in the crowd, along with celebs such as Paris Hilton and singer Mary J. Blige. It was a great night for one of the nicest guys in showbusiness!

Paris Hilton tweets: “Had so much fun at @ScooterBraun’s birthday party last night! Loved watching @JustinBieber perform!”

Usher tweets: WE ARE HAVING THE GREATEST NIGHT EVER!!!! HAPPY BIRTHDAY SCOOTER!!!!”