By the looks of it, Shia LaBeouf’s DUI charges may not be the last of his problems concerning this accident.

Days have gone by with all of us wondering who was in the passenger’s seat? Well, turns out it’s his Transformers 2 costar Isabel Lucas. The problem is that Lucas isn’t dating Shia—she’s dating Entourage star Adrian Grenier!

Lucas, who has been dating Grenier since February, may be in a bit of a relationship difficulty, considering sources are saying Grenier isn’t happy with the fact that his girlfriend was out partying with her gorgeous costar in the wee hours of the Hollywood morning. When asked to comment on how Lucas was feeling post-crash, Grenier became a bit quick-tempered and refused to comment.

It may have been a slightly bad call on Isabel’s part, seeing as her “friend” has a misdemeanor on his hands for drunk driving.

(You can find updates to this story here.)