After landing a gig on the hit TV show The O.C., Mischa Barton reveals that her partying grew out of control.

"We thought, 'Work hard, play hard,' " she told People Magazine.

In 2007, she was arrested for DUI. Then in 2009, shortly after her parents attempted an intervention, she blacked out under the influence of a sedative and landed in the Cedars-Sinai Medical Center psychiatric ward under an involuntary 5150 hold after she threatened to kill herself.

"It was a full-on breakdown," she revealed. "I was under enormous pressure."

Part of the pressure came from weight bullies.

"It was always, 'She's too skinny, she must be sick,'" said Barton, 27. "Then it was, 'She's too big.' I was never the right weight."

Today, Barton claims to be happier and healthier.

"I've learned a lot," she revealed. "I'm stronger now."

Tags: The OC