Actress Mischa Barton was placed under an involuntary psychiatric hold (also known as 5150) by the Los Angeles Police Department and transferred to Cedars-Sinai Medical Canter on Wednesday evening, according to source.

On Wednesday, Access Hollywood revealed that authorities had responded to a non-911 call from the actress' Los Angeles Home at around 3 pm. A patrol car responded and assisted Barton with a "medical issue", a spokesman for the LAPD confirmed.

From Access:
The source claimed that Barton was placed under Section 5150 of the California Welfare and Institutions Code by police and transported to Cedars-Sinai.

According to the code, authorities can hold a person involuntarily if they present a danger to themselves or others, are gravely disabled or suffer from a mental disorder. This same code was used to hold Britney Spears twice in Los Angeles in January 2008.
An LAPD spokes person refused to comment directly, but admitted that if a person was held under a 5150, authorities would be prohibited from revealing the information, due to Health Insurance Portability and Accountability Act (HIPAA) laws.

According to the code, the hospital can also hold Barton involuntarily for up to 72 hours.

Meanwhile, Barton's rep confirmed that the actress won't attend the world premiere of her new film, Homecoming, which opened Thursday night in New York City. No further detailes on the actress were released. The director of Barton's film said those involved in the movie were "saddened" of Barton's no-show at the event.

"I along with everyone on the 'Homecoming' team are saddened to hear that Mischa Barton will not be able to attend the film's premiere tonight in New York," Morgan J. Freeman said in a statement. "Her performance in 'Homecoming' is fantastic, and she will be missed at our premiere."

[via AccessHollywood]