Copyright 2008 Jeff Gentner / Getty Images

Adrian Grenier and Isabel Lucas have broken up, People.com reports, just weeks after Isabel was discovered to be the passenger in a car crash with Shia LaBeouf.

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Just in: All-new video of Isabel Lucas, actress who was in the truck with Shia LaBeouf during his weekend traffic accident. Lucas was spotted in Hollywood with her rumored boyfriend, "Entourage" star Adrian Grenier, who tells the paparazzi "this is not the time for an interview."

Copyright 2008 Jeff Gentner / Getty Images

ET has learned that 'Transformers: Revenge of the Fallen' actress Isabel Lucas, the reported mystery passenger in Shia LaBeouf's weekend truck accident, went back to work on the movie's set on Monday.

Usmagazine.com reports that Lucas, 23, was in the passenger seat when Shia's truck was struck by another car in Hollywood early Sunday.

And there's more. The New York Daily News reports Lucas has been dating "Entourage" star Adrian Grenier for a number of months. Grenier reportedly offered no comment when asked how the Aussie siren was doing after the crash, according to the paper.

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