Last Night's Parties: Bieber & Jaden Smith Play "Beer" Pong At Scooter Braun's Birthday, Andy Garcia Plays Bongos At Hollywood Bowl, & More!

[photo via courtesy of EFG] Scooter Braun turns 30 and Usher, Justin Bieber, and  ¾ of the L.A. music scene turns out; Adam Brody, Saffron Burrows and Rosie Perez help MontBlanc debut The 24 Hour Plays on the West Coast; Metal Magazine presents Beauty For The Sake Of Beauty and celebrates its 5th birthday at the same time at Paul & Andre; Helen Mirren, Hilary Swank and Andy Garcia ring in a new season at the Hollywood Bowl with fireworks, acrobats and music—this weekend had a little something for everyone, so check out all the exclusive events that rocked L.A. this weekend edition of Last Night's Parties.

Scooter Braun's 30th Birthday Party

Where: The Music Box

Who Was There: Scott "Scooter" Braun, Usher, Justin Bieber, Kim Kardashian, Mary J. Blige, Adam Levine, Paris Hilton, Nicky Hilton, David Katzenberg, Jaden Smith, Wilmer Valderrama, Asher Roth, MC Hammer, Rita Wilson.

Other Details: The "most powerful man in entertainment under the age of 30" is no longer under the age of 30, but based on who showed up to his birthday party in Hollywood, the "most powerful" part isn't too far off. The young music mogul welcomed a star studded guest list, and the evening included performances by Bieber, Usher, The Dan Band, Jaden Smith, and even the legendary MC Hammer. Meanwhile, sources say that The Biebs and Jaden Smith were caught playing a little Beirut (Beer Pong, if you must) on the roof of the building, but that it was "just water." Sure it was, Biebs.[photo via]

Montblanc Presents West Coast Debut of The 24 Hr. Plays

Where: The Broad Stage

Who Was There: Adam Brody, Eva Mendez, Gillian Jacobs, Ioan Gruffudd, Jennifer Morrison, Rosie Perez, Sophia Bush, Alice Evans, Amaury Nolasco, Andre Royo, Yvette Nicole Brown, Zachary Levi.

Other Details: Already popular as a fundraising theatrical experiment on the East Coast, The 24 Hr. Plays, where a group of stars has 24 hours to write, direct, rehearse and perform a short play, came to L.A. for the first time this weekend. Stars flocked to The Broad Stage in the Santa Monica College Performing Arts Center, and proceeds went to benefit the Urban Arts Partnership.

"Beauty For The Sake Of Beauty" O.S Gallery Opening Event + Afterparty [Go HERE for a full gallery of photos!]

Where: O.S Gallery, Paul & Andre

Who Was There: Andrea Franco, Priscilla Franco, Jae Joseph, AJ English, BJ Panda Bear, Oscar Olima.

Other Details: Three great reasons to throw a party collided on Friday night, as the O.S Gallery officially opened with the exhibition debut of renowned fashion illustrator Marcela Gutiérrez's "Beauty For The Sake Of Beauty," a synchronous series of openings that coincided nicely with sponsor Metal Magazine's 5th anniversary. Co-sponsored by Prada + Freixenet, the fashion-forward fun spilled out from the gallery to the after party at Paul & Andre, where energetic crowd kept dancing until the wee hours [Go HERE for the full post with all the details from the night!].

Hollywood Bowl Summer Concert Series Opening Night

Where: Hollywood Bowl

Who Was There: Andy Garcia, Danny Elfman, Gloria Estefan, Harry Connick Jr., Helen Mirren, Hilary Swank, Quincy Jones, Cat Deeley.

Other Details: The Hollywood Bowl kicked off its 90th season with a high energy opening gala. Harry Connick Jr. and Gloria Estefan were inducted into the Hollywood Bowl and both musicians took the stage, with Estefan's set including the full Miami Sound Machine and a guest spot on percussion by Andy Garcia. Both the Hollywood Bowl Orchestra and the Youth Orchestra also played, bookending a preview performance of the newest Cirque du Soleil show, IRIS. If the approach of Father's Day had you craving some "old people" style fun that was still way over the top, I hope you made it out to this. [photo via]