What's the quickest way to squander the public's good will? Rihanna is reportedly back together with Chris Brown just three weeks after he allegedly battered her before the Grammys. “They're together again. They care for each other," a source tells People, adding that the pair is currently sojourning at P Diddy’s mansion on Star Island in Miami Beach, one week after Brown called Rihanna to wish her a happy 21st birthday. Criminal charges have yet to be filed against Brown.