Mischa Barton has a new boyfriend.

The former 'O.C.' actress - who was placed under an involuntary psychiatric hold in Los Angeles earlier this year - is dating aspiring actor Leo Wyndham.

Mischa Barton has a "sober coach." Producers on the actress' new TV show "The Beautiful Life" have hired someone to stay with her at all times following her hospitalization under involuntary psychiatric hold at Los Angeles' Cedars-Sinai Medical Center in July.

A source said: "Mischa is doing great since she returned to work, but after a chat with show bosses she agreed she would appreciate some extra support."

Mischa Barton "doesn't know" if she had a nervous breakdown. The former "O.C." actress - who was placed under involuntary psychiatric hold at Los Angeles' Cedars-Sinai Medical Center last month - has blamed the incident on an operation to remove wisdom teeth which went wrong.

She said: "I don't know if it was an official breakdown. I don't know. I had a friend who had a quasi-nervous breakdown, but I'm not sure it's the same thing. I'm not sure I'm capable of a full-on nervous breakdown, but it was pretty bad. It didn't last that long. It was more about the pain.

Mischa Barton's new role won't be toned down because of her personal problems. The actress - who was recently sectioned for psychiatric treatment and has worried friends with her wild partying - plays a model called Sonja Stone in "The Beautiful Life" and producers say she is "embracing" storylines that echo her own troubles.

Mischa Barton has been ordered to lose 10lbs. The actress - who was recently released from hospital after being placed under involuntary psychiatric care - was "shocked to tears" when she was told to slim down for her role as a model in new TV series "The Beautiful Life."

A source told Britain's Star magazine: "She knows that means they are calling her fat behind her back. She knows she is heavier than she needs to be but to hear it like that. It really shook her. How can Mischa play a model when she's looking so heavy?"