The `Rude Boy` hitmaker keeps her svelte physique toned and trim by "walking for miles" through airports while she is jetting between performances all over the world. She said: "I keep fit by walking through so many airports. You end up walking for miles in those places!" The Barbados-born beauty also admitted she loves cooking up hearty, calorific meals - including lasagne and shepherd`s pie - for her friends. She added: "I love cooking, but I don`t get to do it as often as I would like, because I travel so much. My best friend and I are always cooking together. She will maybe do lasagne or shepherd`s pie. "Food from Barbados is so different from British food, but we have a lot of things that are similar - such as shepherd`s pie."