Mischa Barton's friends fear her partying could jeopardize her rehabilitation and health. The former "O.C." actress - who was placed under involuntary psychiatric hold at Los Angeles' Cedars-Sinai Medical Center last month - has infuriated her close pals by partying at the All Points West music festival in New York just days after her release from hospital.

Family friend Eric Ziegenbein told Heat magazine: "It's scary to see her out right after she's received treatment. When I found out she'd been partying again, I was shocked. I thought she would chill out for a bit."

Mischa Barton is on "the verge of another breakdown." Concerned friends of the troubled actress, who was placed under involuntary psychiatric hold at Los Angeles' Cedars-Sinai Medical Center last month, fear she has returned to work on new TV series "The Beautiful Life" too early.

One pal said: "There still are issues. Mischa's just not herself at all. I think she's gone back to work too soon."

Mischa Barton is "unbelievable" in her new TV show, claims Ashton Kutcher. Ashton, who is executive producer of "The Beautiful Life," revealed Mischa has been a true professional on the set following her recent hospitalization.

He said: "She is amazing in the show. I can't wait for people to see it. I think people will be really impressed. For me, I think it is the best I have ever seen Mischa act. I was so excited to have her on the show. I was already a fan of her work, so it was great to get her."

Amy Winehouse is reportedly dating Mischa Barton's ex-boyfriend. The "Rehab" singer - who was granted the first stage in her divorce from Blake Fielder-Civil twelve days ago - is believed to have embarked on a new romance with a millionaire's son James Regan, 26.

Amy, 25, is smitten with the barman and aspiring scriptwriter after he began sending romantic text messages to her while she was staying on the Caribbean island of St. Lucia.

Mischa Barton has been released from hospital. The former "O.C." actress has been allowed to leave Los Angeles' Cedars-Sinai Medical Center - where she was placed under involuntary psychiatric hold on July 15 - to return to work on her new TV show "The Beautiful Life."

Her representative Craig Schneider said Monday: "I can confirm that she's left the hospital with the intention to resume production."