Adrian Grenier ShiaLabeouf032908_01_X17a.jpg Poor Shia LaBeouf - as if his DUI wreck weren't attracting enough negative attention already, now it's being reporting that his passenger was Adrian Grenier's girlfriend!

The Daily News reports that Shia's passenger on the night of his crash was none other than Isabel Lucas, an Australian hottie who's been romantically linked to the Entourage hunk for around three months.

According to a source, LaBeouf and Lucas hit it off on the set of Transformers 2, spending several late nights working together. The source hastily added that LaBeouf and Lucas were "friends" and were probably simply out to blow off some professional steam.

Thankfully, neither Shia nor Isabel sustained injuries severe enough to delay production on Transformers 2; Isabel actually returned to the set Monday morning after receiving treatment for minor cuts and bruises at Cedars Sinai the night of the crash. LaBeouf wasn't so lucky: he won't be back to the set for at least a month - but fortunately, his injury shouldn't prevent Transformers 2 from making its June 2009 release date.

'Course, Shia may not live to see it once Adrian hears this news!

What do you think - were Shia and Isabel just unlucky friends? Or might they have been up to a little more?