VIDEO : Mischa Barton Practicing Moments Before Her ?Dancing with the Stars? Debut

Former O.C. actress Mischa Barton will be making her big debut, as Dancing with the Stars airs tonight. As someone who has never danced, Barton has some big shoes to fill and plenty of nerves to go around. According to her professional dance partner, Artem Chigvintsev, Barton has a few things to work on. ?We?re rehearsing everyday for the maximum hour we?re allowed to. There?s all this technical process but it is exciting.