EXCLUSIVE: Mischa Barton Out Of Control, Partying Details

Jul. 17 2009, Updated 9:52 a.m. ET

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Drugs, alcohol and out-of-control partying have been a central part of rehab-graduate Mischa Barton's life for at least two years, sources

close to the actress tell RadarOnline.com.

More photographs of Mischa spinning out of control!

Mischa was placed on an involuntary psychiatric hold Thursday by Los Angeles police and taken to Cedars-Sinai Medical Center. RadarOnline.com obtained exclusive eyewitness details of the star out partying in recent months.

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