Katy Perry stays in shape by skipping regularly.

The 'Teenage Dream' hitmaker - who is engaged to British comedian Russell Brand - revealed she maintains her trim figure by avoiding fast food and eating healthy, green vegetables.

She said: "I like to skip rope and eat as healthily as I can. I like to have my greens and cut out fast food. I also have regular facials. I'm addicted to Maki at Ole Henriksen spa."

The sexy singer - who is known for her skimpy stage outfits - recently admitted she doesn't need to work hard to maintain her svelte physique, but thinks she will be more prone to putting on weight as she gets older.

The 25-year-old beauty said: "I know I'm kind of voluptuous and I've always been that way. Saying that, I'm young and metabolism is on my side and my schedule is so crazy that I lose weight from the intensity of it. But if you ask me that question in five or six years and I'll probably have a different answer for you."