R&B star Rihanna credits a perfect daily diet for her famous legs and backside. The Umbrella singer admits she's very careful with what she eats - and that helps her stay trim and sexy. The 20-year-old diva explains, "I have egg whites and pineapple for breakfast with hot water and lemon. "For lunch I have fish and potatoes. I hate vegetables, but I make myself eat them. For dinner I have fish again." And the diet helps her keep favorite asset - her backside - in check. She adds, "I keep working at it as I want it to be perfect. It makes my clothes look good - and guys like it."