This bad boy may be exactly the type of rebound romance Katie needs. While there's no denying Gerard likes to party, he also has a reputation for being friendly, social, and, well, generally a nice person. The sexy Scott previously dated Jennifer Aniston, Cameron Diaz, and Cheryl Burke, but he's been single since 2009. We can think of at least "300" reasons why we'd get with Gerry. His eyes, his arms, his abs ... Need we continue?