The pop superstar spends enormous sums on the upkeep of her admired figure, in the areas of food and exercise.

"I need a trainer to motivate me, I don't find it much fun working out on my own," she told a UK tabloid.

Her personal coach apparently costs £980 a day while a chef, who says she likes chicken curry and soups, sets the singer back £520 a day.

'Rude Boy', Rihanna's latest single, yesterday hit the top of the Billboard Hot 100 chart in America, giving her a sixth US number one.