Rihanna RihannaShiaL.jpgNineteen-year-old Rihanna has apparently laughed off reports she's dating Transformers star Shia LaBeouf. Speculation arose after the actor and singer were spotted dining in Beverly Hills on Tuesday, but the Umbrella beauty says they're "just friends." Aw, isn't everybody! Shia's currently filming the latest Indiana Jones movie. Hmm, maybe they were dating until Rihanna saw those on-set pix of him in a leather jacket on a motorcycle and broke it off. Now that's disturbia-ing.