Celebrity engagement rings are so much fun to ogle, er, admire, and sometimes it's just downright impossible to look away from the romantic bling at hand. But that's because these star-studded proposers don't usually have spending limits when it comes time to pop the big question. So, exactly how hard have you been staring? Think you know which guys got down on bended knee to present their leading ladies with these stunning rings? It's time to take this quiz and find out!