Mischa Barton glows in a flowing frock and perfect locks

When she burst onto screens as Marissa Cooper in cult teen drama The O.C. in 2003 Mischa Barton became an instant style icon.Her millions of fans were desperate to emulate the waif-like actress' preppy onscreen look and glamorous red carpet style.But after she left the show in 2006 Mischa has famously struggled to maintain her career - and her fashion sense.But the 25-year-old appears to be