Entourage's Adrian Grenier & Isabel Lucas Split

Looks like Shia LaBeouf didn't just wreck his hand, his car, and filming on the new Transformers movie recently -- seems he also had a hand (hee hee) in the demise of his co-star's relationship.

Isabel Lucas, who was also in the car with Shia the night he was arrested for suspicion of DUI, had been dating Entourage star Adrian Grenier, but that's over now. And it seems her relationship with the ex-Disney star is the reason.

"It wasn't working out," a source told People.com, of the couple who had been dating since the spring. "Adrian saw her with Shia and that was kind of it-- the crash, their hanging out. He obviously didn't appreciate it."

Personally, I didn't even know who Isabel was until she was named as the passenger in the crash, so this isn't particularly upsetting to me, but I do love a good love triangle.

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