Here's a rhetorical question. When Rihanna attends a launch event for a new fragrance named Nude, what would type of outfit would you expect her to turn up at the celebration wearing? Something super provocative and skin flashing, right? Wrong! The always sexy, loves-posing-topless 'Diamonds' singer played it safe in a sweet, demure white lace frock by Nini Nguyen (that has a flirty, see-through skirt) and Tom Ford black pumps at the event in California on Saturday (Dec. 1).