Along with Pink, Rihanna is also featured on Eminem's forthcoming album Recovery (June 22nd). Their collaboration is titled "Love The Way You Lie":
I used to be able to, but I really can't stand Eminem anymore, so Rihanna definitely does it for me on this one. Too bad she is only featured on the hook. Note: I realize (& apologize) that the pitch is modified, but I actually think this sounds better than the real version!