Zimbio, in photo: Adrian Grenier, girlfriend Isabel Lucas
1. Adrian Grenier dated Isabel Lucas
2008 - 2008

Isabel Lucas dated Adrian Grenier for several months in 2008 before they called it quits in August. Lucas was in a car crash with her 'Transformers 2' co-star Shia LaBeouf just before the split, and apparently Grenier was a bit jealous of their friendship.