Adrian Grenier has laughed off reports he was dumped by actress Isabel Lucas for Shia LaBeouf – insisting the pair were never a couple.

The Australian beauty – who was a passenger in LaBeouf’s truck when he crashed in Hollywood at the end of last month – reportedly dropped the Entourage actor in August for her Transformers co-star after the accident.

But Grenier insists LaBeouf didn’t steal his former flame – because he’s been too busy having fun being single in Hollywood to have a serious relationship.

He says, “I thought it was funny that suddenly there was a big scandal, because since when were we dating? First of all, we don’t give each other those labels – it’s more subtle than that. She and I have a very open communication. We’re friends with common interests. Secondly, love and relationships are complicated. No one could ever get it right in a four-line sentence. I’m not married. We’re young in Hollywood and having fun.”

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WENN

Like we didn’t see this one coming, right?

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.

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ET has confirmed that ‘Transformers: Revenge of the Fallen’ actress Isabel Lucas, was the mystery passenger in Shia LaBeouf’s weekend truck accident and went back to work on the movie’s set on Monday.

Isabel Lucas has been dating Adrien Grenier for a while now.

Lucas and the other driver were treated for minor injuries at Cedars-Sinai Medical Center in L.A., while Shia underwent surgery on his hand. The ‘Indiana Jones and the Kingdom of the Crystal Skull‘ star was also arrested on suspicion of DUI, according to a Los Angeles County Sheriff’s spokesman.