Mischa Barton walked the red carpet at the New York City Ballet's annual Spring Gala in Manhattan on Thursday. The actress stunned in a silk dress with matching floor-length jacket and looked smiley and happy while posing for photos. It's been a difficult few years for the former O.C. star, who recently filed a lawsuit against her mother, Nuala. News broke in April that Mischa's "greedy stage mother" posed as her talent manager and "schemed to defraud her unsuspecting victim.