RihannaUnlike most celebrities who claim they’re just naturally thin, Rihanna has bucked the trend and spoken about her hard work to stay in shape.

Speaking to the News of the World, the singer revealed her current svelte physique is the result of “a lot of hard work and a lot of running on the treadmill.”

“Cardio is the key. I have a personal trainer who travels with me if we have a big event coming up. I work out every day but I need a trainer to motivate me - I don’t find it much fun working out on my own.”

As for her diet, “carbs are the enemy but if I go three days without them, I start getting weak. If my trainer had her way, I’d eat small meals every three hours, but I sometimes only eat once or twice a day. 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.”

But while she strives for a perfect bum, she admits she’s insecure about her legs: “Everyone wants to have slim, perfectly-toned legs and I’m the same. I do weights but I don’t want my legs to bulk up so I do a lot of cardio. I’ve lost a lot of weight since I started working out and if I exercise every day for a week, I can drop several pounds. If I diet, I see even faster results.”

“My size varies - sometimes I’m a [US] 2, sometimes 4 [UK 6 or 8] - but what matters is being fit and healthy. Being slim makes me feel better about myself. It boosts my self-esteem, and having a toned body helps with my job because I wear a lot of skimpy costumes. My weight fluctuates, but I don’t weigh myself every day. I’m 5ft 8in and weigh around 9st 7lb.”

She added that she isn’t interested in cosmetic surgery at the moment: “but I can’t say for sure that I wouldn’t in the future. If my breasts started to drop, I might not like that. But for the next 20-25 years, I’m going to stay as natural as possible.”