Tackling a subject she knows all too well, Rihanna takes on domestic violence by being featured in an Eminem video starring Megan Fox and Dominic Monaghan as a couple stuck in a cycle of fighting, drinking, shoplifting and pyromania. In the video, Rihanna, 22, sings outside a house that bursts into flames while a couple – Fox and Monaghan – alternately physically abuse and kiss each other. In a field of yellow grass, meanwhile, Eminem raps in his signature undershirt (yes, a "wifebeater"). I can't tell you what it really is