Like We Didn't See This Coming

Adrian Grenier and his girlfriend, Transformers 2 star Isabel Lucas, have split on the heels of her car crash while driving with costar Shia LaBeouf, a source tells PEOPLE.

The pair broke up about three weeks ago, right after the accident that left LaBeouf with a crushed hand. "It wasn't working out," says a source. "Adrian saw her with Shia and that was kind of it – the crash, their hanging out. He obviously didn't appreciate it."

Lucas, 22, was the passenger in LaBeouf's car. She was treated for minor bumps and bruises at the hospital and released.

According to reports, Lucas had been dating Entourage star Grenier, 32, for several months.

Reps for Grenier and Lucas weren't immediately available for comment.

People