updated 07/29/2008 AT 10:45 AM ET
•originally published 07/29/2008 AT 11:55 AM ET
As Shia LaBeouf continues to recover from his weekend car accident and DUI arrest in Hollywood, his mystery passenger has been identified as Transformers 2 costar Isabel Lucas, PEOPLE has confirmed.
The Australian actress, 23, was at LaBeouf’s side at the time of the car crash, the New York Daily News first reported on Tuesday.
Lucas, who was treated for minor bumps and bruises at Cedars-Sinai Medical Center and released, is “friends” with LaBeouf, a movie source told the Daily News, adding that Lucas was well enough to return to the Transformers set on Monday.
The 22-year-old actor’s mom, Shayna LaBeouf told E! News that her son is doing well, despite his injuries from the car-flipping crash in the early hours of Sunday morning. “I’m at the hospital right now, he’s doing fine,” Shayna said.
The actor is recovering from hand surgery that will keep him from filming Transformers 2 for a month.
According to reports, Lucas has been dating Entourage star Adrian Grenier for several months.