Inside Justin Bieber's Surprise 18th Birthday Party

Kendall and Kylie Jenner, Mike Tyson via Getty Images, Justin Bieber and Selena Gomez via Bauer Griffinmore pics Justin Bieber and Selena Gomez (Bauer Griffin) Scooter Braun should be up for Manager of the Year, if there is such a thing. First he got his client Justin Bieber a $102,000 car for his 18th birthday. Then he threw a surprise party for the now-adult star Friday night -- with the help of the Biebs' mom, of course.

The fiesta was held at the luxury Regent Beverly Wilshire Hotel and included a host of famous guests. Most importantly, Bieber's girlfriend Selena Gomez was there. She made the appearance after flying in from Florida, where she's filming Spring Breakers. The birthday boy's grandparents and some childhood friends also made a trek to L.A. for the festivities. They flew in from Canada!

Other guests included Kim Kardashian and stepsisters Kendall and Kylie Jenner, and the Aussie version of Bieber, Cody Simpson. And, we can't leave out the fact that Mike Tyson graced the party with his presence. Yes, Mik! e Tyson. Turns out the guy is a great piano player AND a huge Bieber fan.

Unnamed partygoers say the bash was hoppin'. "Everyone danced all night," the highly reputable source told Us magazine.

There's photographic evidence to support another anonymous source who said the Biebs couldn't get enough of his girlfriend during the event. "He was all over Selena the whole time, walking her around by the hand. He kept kissing her," the insider said. "It's clear she was the best part of the night for him. He is still so in love with her."

Gomez did look particularly gorgeous at the party. She wore a shiny red strapless dress that nicely coordinated with the singer's black and white suit.

See more Justin Bieber and Selena Gomez pics here:

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