Beyonce Knowles has revealed the secret behind keeping her famous bootylicious frame-climbing flights of stairs.

Mrs. Carter say that although she was born with the genes for a shapely bottom, she maintains it by climbing flights of steps.

“I guess my butt is natural. But I go through stages like every woman. I like being curvy but sometimes I get curvy in the wrong places.”

She added: “After New Year I do stairs – they are the best thing for butt cheeks. Every January I’ll start working out. I’ll do that for three months and then stop again!”