WARNING TO CHRIS BROWN: Do not cheat on Rihanna. On her new Stargate-produced single, she goes bonkers when her boyfriend is unfaithful to her: "Grab your clothes and get gone/You better hurry up before the sprinklers come on." (In the video, the poor guy reaches his clothes only after she has already set them on fire.) Written by Ne-Yo, the ballad has the same sultry, clap-along rhythm of "Hate That I Love You," just with extra rage: "Trying to apologize?" Rihanna taunts. "You're so ugly when you cry." Ouch.