Mischa Barton was submitted involuntarily to a California mental health facility last week, and she’s still there. According to insiders, friends and associates have been trying to get Mischa into some sort of treatment for months, including party pal Lindsay Lohan.

The two club regulars often partied together into the early morning hours. But last year, Lindsay walked away from the friendship after a messy Mischa pushed Lindsay over the edge. Sources close to Lohan tell Fox 411 that the two girls haven’t spoken for months, but Lindsay would help Mischa if she asked for help to get through this latest fiasco.

“Lindsay and Mischa used to go out all the time together in Los Angeles. They were like kindred spirits when it came to clubbing and letting loose,” says the insider. “ They have many mutual friends, but everything shifted for Lindsay last year at a party. Mischa was completely out of control, and Lindsay sat Mischa down then to make it clear that she needed help. Lindsay was desperate for Mischa to clean herself up and offered a treatment facility and a therapist to help Mischa. Mischa completely ignored Lindsay, and that was the end.”

Several people close to the “OC” actress tell FOX411 she’s been on a downward spiral for years. “No one close to her is surprised,” says one pal. “Alcohol was like the gateway to other things for Mischa. Nobody has been able to stop her until now. Hopefully this psychiatric hold will force her to seek real help.”

Mischa’s latest stylist deserted her as well, says the insider, warning that ”Mischa must get help or she will be all alone. She can’t continue down the path of the last two years or so. It’s destructive and it will end her career for good.”

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Production on Mischa Barton’s new CW drama The Beautiful Life has been postponed as the actress remains under psychiatric evaluation at Cedars-Sinai Medical Center in Los Angeles.

Shooting was to begin July 22 but will now start July 31, according to the Hollywood Reporter.

Despite the actress’ hospitalization, the production schedule was changed due to some of the sets not being completed, the paper reports.

Beautiful Life, which is executive produced by Ashton Kutcher, centers on a group of models living together in a coed residence in New York. Barton plays a supermodel and veteran of the high-fashion circuit who is struggling to keep on top and is in danger of slipping.

The series is slated to premiere Sept. 16.

There is still no word on when Barton will be released from the hospital.

Source, Bauer-Griffin

A producer on Mischa Barton’s new flick Homecoming isn’t thrilled she missed the NYC premiere after being involuntarily checked into a psych ward Wednesday.

“It’s frustrating. And it’s not ideal,” Bingo Gubelmann told Usmagazine.com at the Thursday premiere. “It’s frustrating, but I’m not going to sit here and trash her because we’re young as a company and we’ve got to live and learn…I don’t want to be known as the producer that will turn on any actress at the drop of that hat.”

While rolling his eyes, Gubelmann continued that “it’s hard to remember” why he chose Barton to star in his indie flick, “because, you know, she’s not here right now.

“Now, I haven’t spoken to her yet because she’s totally unreachable, so I don’t know exactly what happened. I mean, I’m not as good at taking the high road a some people and yes, it would obviously be nice if she was here. Even just to hang out,” he went on.

Gubelmann said Barton didn’t seem “at all” unstable while shooting the flick in less than a month, 16 hours a day.

“She did it and she did an amazing job. It’s like, maybe she went method and maybe that’s what happened!” he said, laughing.

Producer Austin Stark was more sympathetic toward the actress, who required a police escort from her Hollywood Hills home to the hospital.

“I think we would have loved to have had her come out and support the movie, [but] you know, we wish her the best and obviously we hope she gets better,” he told Us. “Obviously, it’s a trying time for her. I mean, obviously we’d like her to be here but I don’t think it hurts the movie.”

Added producer Benji Kohn: “She’s going through a rough patch and she can’t be here. And it’s really too bad.”

Director Morgan J. Freeman told Us: “I hope Mischa is doing OK. My thoughts and prayers are with her. Health first, movie second.”

Source, Fame Pictures

Almost a year after describing her DUI arrest as “a low point,” Mischa Barton – who called police with a health problem Wednesday – may be hitting another rough patch.

“She has been dealing with a lot of personal issues,” a pal tells PEOPLE about the actress who has been spotted club hopping in L.A. and London the past few months. “I don’t know if she really ever gave up some of the bad habits that had gotten out of control a couple years back.”

The 23-year-old actress was scheduled to attend the premiere of her movie Homecoming Thursday night in New York City but Access Hollywood reports she remained at Cedars-Sinai Medical Center in Los Angeles under psychiatric hold.

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Mischa Barton was suffering from some sort of medical issue that landed her in the hospital yesterday. Now, we’ve just found out that she’s been placed under an involuntary psychiatric, 5150, hold by the LAPD.

Last night she was transferred to Cedars-Sinai Medical Center, according to sources. The police were summoned to Mischa’s home yesterday for a mysterious medical issue.

According to the 5150 code, Mischa can be held for up to 72 hours if she is deemed a threat to herself or anyone else.

Get well soon, Mischa!

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Mischa Barton was removed from her West Hollywood home Wednesday by police, an LAPD spokesperson confirms to Usmagazine.com.

“We responded to her home last night on a medical issue,” Officer April Harding tells Us. “We assisted with it. She was removed from her home.”

Harding tells Us no 911 call was received, and that she was not sure if Barton, 23, was in distress. When asked if the actress was cooperative, she tells Us: “I guess.”

Harding did not release details on where Barton was taken, citing California privacy laws.

A source tells Us Barton called the police herself after having a “freak out.”

The actress — best known for her role on The O.C. — was charged in 2008 with DUI and marijuana possession. She was sentenced to 36 months probation, told to attend alcohol education classes and pay a fine.

Barton checked into rehab after the incident, she said, because “I wanted to prove to the court that I would take it completely seriously.

“I went to rehab to prove I was sober,” continued Barton in an interview with UK Marie Claire.

She’s set to star in Beautiful Life, premiering this fall on the CW.

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Fame