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Marc Malkin, Robert Pattinson, Instagram

Instagram

Robert Pattinson may be British, but that doesn't mean he can't celebrate the Fourth of July.

The actor was among the star-studded crowd at 1OAK's pop-up last night at Nobu in Malibu.

Pattinson arrived at the party at about 9:30 p.m. with The Lying Game actor Ryan Rottman. "He was wearing a hat and trying to stay undercover," a fellow partygoer tells me. "He hung out at a corner table and was flirtatious with multiple girls all night. He stayed through the performances and was really enjoying himself."

Chris Brown, Tyga, Jamie Foxx

Steven Meiers 2014

Chris Brown Jamie Foxx and Tyga surprised the crowd with impromptu performances of their hits, including "Loyal" and "Gold Digger."

"Rob seemed extremely into the music, smiling and dancing nearly the whole time," another eyewitness said.

Hosted by Richie Akiva, Scott Sartiano, Ronnie Madra Darren Dzienciol and Wildfox CEO Jimmy Sommers, the bash also attracted Chace Crawford, Courtney Love, Ryan Phillippe, Elle Fanning, Paris Hilton, Ellen Pompeo, Brody Jenner, James Marsden, Mel B, celebrity deejay Samantha Ronson and Brown's girlfriend Karrueche Tran.

Also in Malibu, Selena Gomez (in an adorable flower print top) partied at the Bootsy Bellows pop-up at Mastro's Ocean Club.

Courtney Love

Steven Meiers 2014