LOS ANGELES: Cops arrived at around 3pm on Wednesday afternoon and took the 23-year-old star from her apartment, in West Hollywood, to an unknown location.

A Los Angeles Police Department spokesperson has said that they are "currently assisting" Barton and no one else is believed to have been involved in the incident.

Mischa has previously been charged with driving while under the influence of alcohol and possessing marijuana.

In April 2008, she was sentenced by a Los Angeles court judge to 36 months probation, told to attend alcohol education classes and had to pay a large fine.

Talking about her recent stint in rehab, Mischa said: "I wanted to prove to the court that I would take it completely seriously, so I went to rehab to prove I was sober.

"It really helped in getting the more serious aspects of my case dropped because, you know, that's what they want to hear; you're not an alcoholic and you don't have a problem.

"So I did it in the most low-key way possible - I didn't make a fuss about it and I didn't tell a lot of my friends. I just did the program and got through it."

Mischa and her representatives have so far been unavailable for comment.