I think it was a certain Robin costume where I first saw Chris O'Donnell and thought he's pretty handsome. Or words to that effect anyway. When I started watching NCIS: Los Angeles it was good to see him finally get a series and also meant that he would be on my TV often. You may have seen him in in the film Scent of a Woman and TV series Grey's Anatomy, he was also down to play Jack Dawson in Titanic but Leo DiCaprio got the role.
