Coke binge caused Barton’s breakdown?

Reports are circulating that Mischa Barton’s recent breakdown came after a three-day cocaine binge.

The former “O.C.” actress was placed on involuntary psychiatric hold Thursday after suffering a meltdown and calling cops to her Los Angeles home the day before.

According to New York Post gossip column PageSix, friends of Barton alerted police earlier, afraid she would kill herself after three days of hard partying.

“She’s in very bad shape. 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 mess. She is a suicidal, uninsurable mess,” said a friend.

Los Angeles police and Barton’s representative have confirmed the actress required assistance for “a medical issue”, but have yet to reveal further details.