She came to London to visit Fashion Week, had a few drinks and took a taxi ride. But on the way out her dress fell from her left shoulder and we could see quite clearly Mischa barton’s nipple slip. I won’t comment if it looks hot or not, because we are generally happy to see celebrity boobs whenever we can. Actress Mischa Barton seems to have quite a bit of problems with her dressing habbits since this isn’t her first nipple slip.