mbarton021908.jpg Oh BOY.

Mischa Barton was placed under an involuntary psychiatric hold (aka a 5150) by the Los Angeles Police Department, and she was transferred to Cedars-Sinai Medical Center, reports Access Hollywood!

Last night authorities showed up at Mischa's Hollywood home after receiving a call from her residence around 3pm. A patrol car responded to the scene and began assisting the actress with a “medical issue,” according spokesperson for the LAPD.

As you may remember from the Britney days, under a 5150, authorities can hold a person involuntarily if they present a danger to themselves or others, are gravely disabled or suffer from a mental disorder.

When asked about Mischa, an LAPD spokesperson would not comment, but they admitted to Access that with any person held under a 5150, authorities are prohibited from disclosing the information due to Health Insurance Portability and Accountability Act (HIPAA) laws.

What's going on here?! Was Mischa merely having a rough day and acting overly dramatic, or is there something really wrong here?