Every Osbourne has an addiction of some sort: Kelly gets her fashion fix, Sharon enjoys the plastic surgery, and Jack Osbourne loves Pilates.

The star claims that there is no better way to keep in shape and credits the low-impact stretching exercise with keeping him trim: “I know it’s a bit camp, but I go to Pilates classes three times a week and I love it! I’m so toned now, it’s amazing. It’s very relaxing too. I’ve also been running and doing weights.”

Jack, 23, dropped 70lbs in 2005 and is determined to ensure he does not pile on the weight again. He sticks to a healthy diet of vegetables and rice, but does admit occasionally caving in to his cravings for pizza.

He added to Britain’s Closer magazine, “Girls seem to prefer me when I’m in shape. I’m seeing someone at the moment—she lives in Los Angeles. It’s nothing too serious though because my work schedule is so hectic that I don’t get to see her much. I love being in a relationship, but I never want to get married. Statistically speaking, I’d end up getting divorced, and I really don’t fancy that.”