Def Jam So r’n’b superstar Rihanna is in rehab. But precisely what addiction is she battling? Acute parasol dependence? Chronic aversion to stopping the music? Actually, addiction here seems to be a metaphor for romantic love, and rehab a metaphor for physical separation. If I follow correctly, this makes Keith Richards cupid and Cheech & Chong’s Up in Smoke the greatest love story ever told . . . No?