Mischa Barton has allegedly been drinking heavily and experimenting with drugs, much to the concern of her friends, it has been reported.
The 23-year-old actress is currently under psychiatric evaluation at Los Angeles' Cedars-Sinai Medical Center, but could be released soon if doctors deem her stable or she demands to leave.
A source told People magazine: "She has been on a destructive path for a while now. Her drug and alcohol use has gotten to a point where it drove people away. I don't think she knows her limits."
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Mischa was placed into the psychiatric care under 5150 hold order - same the piece of legislation which was used to hold Britney Spears after she suffered a breakdown in 2008.
In April 2008, Mischa Barton pleaded no contest to drink driving and later went to rehab to prove she "was sober".