A source for News of the World claims that the 21-year-old actress has been involved with 32-year-old Robbie for the past few weeks. The insider says, "Robbie really likes Michelle - he especially loves her sense of humor. They're having a great time just hanging out."

Indeed, Williams and Trachtenberg were recently photographed hanging out at the hip Hollywood boutique, Fred Segal. Luckily for Michelle, this relationship may turn out to be more low-key than some of her others - at least in the U.S. Says the source, "As we all know, Robbie doesn't have a high celebrity profile in the States despite many attempts to launch his career over there. So as far as Michelle is concerned, she's just spending time with a normal bloke from a place called Stoke. That's just how Rob likes it."