Mischa Barton remains under an involuntary psychiatric hold at Cedars-Sinai Medical Center's in Los Angeles.

As the actress undergoes evaluation and receives treatment, new information is leaking out about what landed the skinny star in trouble in the first place.

Sources have told The New York Post that Barton was coming off a three-day cocaine binge late last week when friends became concerned that she might kill herself. As a result, they called the police.

"She's in very bad shape," an insider told the newspaper. "She's running out of money and can't find love, so now she is looking for a good time to escape her misery. She is on a downward spiral. She is a suicidal, uninsurable mess."

Reportedly, Barton was stumbling around the pool of an L.A. hotel last week, even removing her top at one point, oblivious to onlookers.

Said another friend:

"She is a tortured and troubled person. You can survive a bad review, but when you don't show up for the premiere of your new film, it's not a good sign of where your career is heading."

Regarding that career: The Beautiful Life, Mischa's new show on The CW that debuts this fall, is scheduled to shoot on July 31. No yet word about the actress' status on the series.