SPLIT!

Arian Grenier and Isabel Lucas have called it quits.

Isabel has been spending much of her time with Shia LaBeouf and People.com reports that 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."