David O’Donnell and Patrick Dempsey
Patrick Dempsey AKA “Dr. McDreamy” stole our hearts in Grey’s Anatomy has a celeb double, David O’Donnell. While O’Donnell, 43, isn’t a household name, he has had over 25 guest starring roles on TV and appeared in over 30 films including Thirteen Days with Kevin Costner. Dempsey, 52, is married and has three children. He is also a philanthropist starting the Patrick Dempsey Center for Cancer Hope and Healing after his mother developed cancer.