(DailyMail) - She recently bared all for the cover of her seventh studio album Unapologetic and again when she fronted GQ magazine. But keen to show her figure off some more, Rihanna has stripped off again in a series of saucy Twitter pictures. Photographed by her best friend Melissa Forde, the 24-year-old Diamonds singer just about manages to retain her modesty as she strikes a pose.