Single girls everywhere are mourning the engagement of the world's most eligible silver fox, George Clooney. Yes, the notoriously long-time singleton (and serial dater) has finally put a ring on the finger of British lawyer Amal Alamuddin. Now that he's all fiance-ed, Christen reminds us of all of George's most memorable girlfriends from a dating roster that would make even Leonardo DiCaprio blush.