NEW YORK (AP) — Chris Brown will perform at this year's Grammy Awards, the event where his career almost ended three years ago. Brown admitted assaulting then-girlfriend Rihanna at a pre-Grammy party in 2009 and is serving five years of probation for the felony attack. The Recording Academy announced Tuesday that Brown will take the Grammy stage on Sunday. After the attack, Brown's reputation plummeted, but he has since bounced back, releasing multiple mixtapes and the multi-hit album, A...