Kelly Osbourne has revealed the secret to her svelte new look - landing a theatre role and throwing away her microwave. Weight has dropped off Osbourne since she began rehearsals for her role as Mama Morton in the West End production of Chicago. She also reveals a healthier diet has helped her slim down. Osbourne tells British magazine Closer, "The only reason I've lost weight is because I've been working. My best tip is to get rid of your microwave. It's the easiest thing to chuck some three-minute meal in. If you don't have one, you'll pick up something fresh. "I don't ever want to be one of those people on some crap fad diet. It's not healthy. People on stupid duets are miserable - they're hungry all the time. I'm happy and I'm fed." But she insists she will never be stick thin: "In the words of Bridget Jones, I will always be a little fat and I don't care. When you're my height, a couple of pounds off or on does make a difference. I'll always have a double chin in a pap shot, no matter how I look."