Patrick Dempsey arrived to start shooting his section of the ensemble movie Valentine's Day in LA yesterday. Both Patrick and his Grey's Anatomy costar Eric Dane will be taking part in the film, but only Dempsey will be donning scrubs to play another doctor. His next role is also a familiar one — Patrick just signed on to play a race car driver, which is a chance for Patrick to show off his passion as a driving and car enthusiast.