Inside Mischa Barton's 33rd Birthday Bash with 'Hills' Costars Audrina Patridge and Jason Wahler

The O.C. star Mischa Barton turned 33 on Thursday

Photo: Caroline D'Amore/Instagram

Happy birthday, Mischa Barton!

The O.C. alum turned 33 on Thursday, celebrating with close friends and castmates at a party in West Hollywood.

Barton rang in the occasion with some of her The Hills: New Beginning costars at Mediterranean restaurant Cleo Third Street.

Audrina Patridge and Jason Wahler — who will appear alongside Barton in the MTV reality series reboot — both attended, along with Wahler’s wife, Ashley, and DJ Caroline D’Amore.

Wahler, 32, posted multiple snapshots from the “birthday bash” to his Instagram Story, including a video of the attendees singing “Happy Birthday” to Barton.

Caroline D'Amore/Instagram
Jason Wahler/Instagram
Jason Wahler/Instagram
Jason Wahler/Instagram

“Happy birthday!” he wrote to Barton on the video, which featured the actress sitting in front of her white birthday cake. “Love your face.”

Mother of one Patridge, 33, also documented a daytime celebration on her Instagram Story, sharing a video of a happy Barton blowing out her candelit birthday cake.

Audrina Patridge/Instagram
Audrina Patridge/Instagram

The birthday girl also posted a snap of the cookie dough cake, which read “Happy birthday, Mischa!”

Audrina Patridge/Instagram

In October, Barton confirmed that she had joined the cast of The Hills reboot.

“The secret’s out… I’m joining the cast of The Hills,” she captioned an instagram. “When MTV approached me with the chance to be a part of the reality show that was inspired by The OC, it felt like the perfect opportunity for an irresistibly inviting new chapter.”

Along with the message, the actress posted a video of herself listening to The Hills‘ original theme song “Unwritten.”

“Welcome to The Hills, bitch,” she said while taking off a pair of sunglasses.

Though she never appeared on the original series, which aired for six seasons from 2006-2010, Barton has a special connection to the MTV show. At 17, she was catapulted to fame for her starring role as Marissa Cooper on Fox’s The O.C., which premiered in 2003 and became a cult phenomenon almost overnight. The O.C. inspired MTV’s Laguna Beach: The Real Orange County, which eventually spun off into The Hills.

The Hills: New Beginnings was announced in August, when a handful of cast members reunited on the red carpet at the MTV Video Music Awards.

The revival, set to premiere this year will reunite original cast members — including Heidi and Spencer Pratt, Brody Jenner, Whitney Port, Stephanie Pratt, Justin Bobby, Frankie Delgado, Patridge and Wahler — alongside their children, friends and some new faces, and follow their personal and professional lives while living in Los Angeles.

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