Rihanna's been flying under the radar lately. But just when you thought the pop world's darling-gone-bad was toning the drama down, she one-ups herself. Apparently poor lifestyle choices like excessive partying, drugs, and—ahem—Chris Brown, have resulted in a doctor's warning. She recently canceled concerts in Boston and Baltimore due to laryngitis. Plus, Rihanna's friends are turning on her, and management is threatening to pull her off tour. Maybe it really is time to take a chill pill.