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Former “The O.C.” star Mischa Barton was snapped making her latest TV comeback on the NYC set of “Law & Order,” where she guest stars as a prostitute on an upcoming episode. The once-scary-skinny starlet has recently come under fire in the media for looking worse for wear. Here’s a look at Mischa Barton in reverse chronological order. Jackson Lee / Splash News
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Mischa Barton on the set of Ashton Kutcher’s now-canceled CW series, “The Beautiful Life.” The CW
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Mischa Barton at New York Fashion Week posing backstage after the Herve Leger by Max Azria show. Dave Allocca/Startraksphoto.com
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Mischa Barton poses during a Fashion Week after party for designer Alexander Wang. Dave Allocca/Startraksphoto.com
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Mischa Barton was taken away by police and hospitalized under California’s involuntary psychiatric-hold law just hours before she was due to fly to New York for the premiere of her movie, “Homecoming ” last fall. (PAGE SIX: Mischa Lands in Psych Ward ).
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Mischa Barton, 23, looked bloated and almost unrecognizable at a public appearance in August, which her reps blamed on the removal of a wisdom tooth.
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Mischa Barton parting in London last summer.
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Barton leaving NYC hotspot Bungalow 8 after a night of partying in June.
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The former “O.C.” star shades her eyes as she walks away from Bungalow 8 late at night.
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Mischa Barton attends an Herbal Essences Young Icons event in Moscow in May.
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The fashion forward starlet attends April’s Matthew Williamson collection launch at H&M in London.
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Running in heels, Barton hurries to launch her new handbag collection at The Soho Hotel in London this past April.
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On a February night, Mischa Barton parties in West Hollywood.
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Barton makes her way to the G-Star Raw Fall 2009 Show during February’s New York Fashion Week.
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In between fashion shows, Barton shops around NYC.
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During New York Fashion Week, Mischa Barton attends the Matthew Williamson store opening.
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Barton poses backstage at the Miss Sixty Fashion Show.
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In January, Barton shops in Paris during Fashion Week abroad.
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A glam Mischa Barton poses before the the Christian Dior Spring/Summer 2009 Haute Couture Fashion Show.
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Barton arriving to Paris for Fashion Week.
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In November, 2008, Barton slips into a floor-sweeping black-and-white gown for Dsquared2 and W event in LA.
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In October, 2008, Barton attends the Vanity Fair Portraits: Photographs 1913-2008 exhibit grand opening in LA.
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Barton dresses up for “The Happening” movie premiere red carpet in NY in June.
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Mischa Barton attends the Quintessentially & Margherita Missoni party during the 2008 Cannes Film Festival in France.
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Barton’s mug shot from when she was arrested for DUI and marijuana possession in LA after driving in two lanes during a break from the movie’s location work in Pittsburgh in 2007. She later checked into rehab.
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In September, 2007, Mischa Barton arrives at the Fashion Rocks Concert at Radio City Music Hall in NY.
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Barton gets some sun at the Hamptons’ 2007 Mercedes-Benz Polo Challenge in August.
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Barton, again in black and white, at the Cinema Against Aids event, May, 2007.
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After lunch, Barton hails a cab with her pup from NY’s West Village in March.
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Mischa Barton at a 2007 Golden Globe after party.
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A young Barton poses with her sister for a Teen Vogue issue party in September of 2006.
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Barton sits front row at New York Fashion Week’s Spring 2007 shows.
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Barton at NY’s Top of the Rock in March, 2006.
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Switching coasts, Barton walks the red carpet for LA Fashion Week in March.
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Yet again in a black-and-white ensemble, Barton is a guest at the Vanity Fair Oscar Party in West Hollywood.
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In late 2005, the hot star unveils the Spring 2006 Keds Ad campaign.
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Mischa Barton is best known as the former willowy star of teen TV drama “The O.C.”
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Mischa Barton as “The O.C.’s” Marissa Cooper for the hit drama’s third season.
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In late 2004, the cast of “The O.C.” hits up LA.
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Mischa Barton as “The O.C.’s” Marissa Cooper for season two.
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Barton at the 2004 Teen Choice Awards in August.
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Barton helps launch “The O.C.” as Marissa Cooper for this first-season promo photo.
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Tan and blonde, Mischa Barton walks the red carpet at the 2003 Billboard Music Awards in Las Vegas.
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TV’s soon-to-be most-popular couple, Benjamin McKenzie as Ryan Atwood and Mischa Barton as Marissa Cooper pose for a photo for “The O.C.” in 2003.