Actress Mischa Barton Sunday was well behaved while taking in an acoustic Peter Bjorn set at New York City's Cooper Square Hotel, a source told RadarOnline.com Monday.

The actress -- fresh off a stint at LA's Cedar-Sinai Hospital where she involuntary hospitalized for undisclosed reasons -- stayed in the VIP section, drinking Arizona Vapor Water and smoking cigarettes with model cronies Daisy Lowe and Karolina Kurkova.

NEW PICS: Mischa Barton Beaming in NYC

Her new show, The Beautiful Life, is slated to premiere September 16 at 9/8c on the CW.

It's currently in production in New York.

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• TAGS
• Britney Spears
• Corbin Bleu
• Elle Macpherson
• Mischa Barton
• The Beautiful Life

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