Mischa Barton

Peter Gallagher is 'grateful' his 'O.C.' costar Mischa Barton is 'still alive' after personal struggles.

Amid rumors Leonardo DiCaprio was dating a 19-year-old, a resurfaced interview showed 'The O.C.' alum Mischa Barton was once told to do the same.

The O.C. alums Mischa Barton and Rachel Bilson "never got on well," says an insider, and now it seems their mutual dislike has gone up a notch.

Mischa Barton revealed she felt pressured to lose her virginity while starring on 'The O.C.'.

Countering claims that Mischa Barton was "bullied" on the set of 'The O.C.', a source said the real problem was with Barton herself, who was a "nightmare" to work with.

More than a decade after her exit from 'The O.C.,' Mischa Barton is opening up about why she opted to kill off her character as well as the 'general bullying' that happened on set.

Barton looked a little bit different in front of the camera.

The actress pulled the plug on their relationship to focus on her career.

‘The Hills: New Beginnings’ star called his castmates ‘psychopathic liars.’

'We’ve put our whole lives into this show,' the reality star said.

The cast walked the red carpet in Los Angeles in June 19.

The event was hosted by Keith Richards’ daughters Alexandra and Theodora.

The actress is trying her hand at reality TV after her role on 'The O.C.'

'It wasn't the end of the book, it was only the end of a chapter.'

The ‘New Beginnings’ star says her group of friends are typical California girls.

The reality TV star talks all about the ‘nightmare’ of shooting the reboot show.

The cast turned out in full force to support the designer.

The couple dated while filming the original version of the show in the early 2000s.

The two have been busy filming scenes for the MTV reality show reboot.

She was confirmed to be part of the show's reboot earlier this month.

She's dressed to impress at a West Hollywood hotspot.

When it was revealed Mischa Barton has signed on to join The Hills reboot, in a way it made complete sense. Of course the OG OC girl, Marissa Cooper, would sign

The actress flaunts her new reality role in an Instagram video.

'The O.C.' star will join another new cast member and the rest of the original gang.

The actress is 'terrified' of her ex, Adam Spaw.

Looks like Mischa Barton can't maintain her regular, bougie quality of life anymore. Her credit card was recently turned down at a post Beverly Hills hotel.

Find out how much Mishca Barton's sex tape is worth and what are some porn insider's saying about the video.

Just weeks after a very public meltdown where she threatened to kill herself, Mischa Barton hit the beaches to pose for a bottled water ad campaign.

Mischa Barton is not behaving like someone who wants to recover from a recent health scare. The actress was hospitalized after behaving strangely.

Mischa Barton's drug-fueled downward spiral reached new heights last month – and only RadarOnline.com has the disturbing text messages and photos

With her odd breakdown now behind her, Mischa Barton looks like she’s trying to bring some normalcy back into her life by getting out on the town.

Mischa Barton thanks her fans for their support after her major meltdown, where she was hospitalized after being filmed going on an incoherent rant.

The actress claims she was roofied.

Mischa Barton has been released from the hospital and is saying she was drugged.

She also had an incident in 2009.

Cops called to transport the troubled 'OC' actress.

Adam Levine took to the stage at Maroon 5's 10th Annual Smashing Halloween Bash is Los Angeles.

She’s has something to prove to fans.

Mischa Barton turned heads on the red carpet of the Toronto International Film Festival AMBI Gala on September 9 in a plunging red gown.

Farm of horrors! A woman claims serious injuries on the Little People, Big World, property. Now, she’s launching a $1 million lawsuit. Read More Mischa Barton

Mischa Barton will soon be airing out all her dirty laundry in a tell-all book about her career and rise to fame.

She's finally opening up about her mental issues, so take a look back at her life for the last few years.

Jamie Dornan will make for one hot Christian Grey! Just see all the women in Hollywood who have agreed.

List of celebrities who used to be famous but are no longer celebrities like Mischa Barton, Josh Hartnett, Rachael Leigh Cook, child stars.

Let that Thursday night, mid-00s joy wash over you.

Rise and shine, pop culture fans! Rub your eyes, get to stretchin', and pour yourself a hot cup of coffee because it's time to start your day off right with a