adrian grenier and isabel lucasEntourage star Adrian Grenier has reportedly split up from girlfriend Isabel Lucas, just as rumours started to swirl that she was involved with Transformers co-star Shia LaBeouf.

Isabel was Shia’s passenger at the time of his car crash in late July and sources close to the actress claim she split from Adrian just days later.

A source told Us Weekly: “The relationship wasn’t working out for either of them. [But] all that stuff that happened with Shia definitely didn’t help things.

“When Adrian saw Isabel with Shia, he knew it was time to move on and made the decision to end things. He’s not upset and thinks Isabel is a really sweet girl but they’re done.”

Isabel sustained cuts and bruises in the crash which left Shia’s car on its roof and his hand requiring “extensive surgery”. She had been dating Adrian since the early spring.