Not every celebrity on ABC's Dancing With the Stars will perform a perfect tango -- but the contestants are guaranteed a big jump-start on achieving a perfect body. For both the stars and the professional dancers on the show, "weight loss is easy and rapid," dancing pro Karina Smirnoff tells Life & Style. "The dancing is the diet, but everyone is different. So if celebrities really want to get the most out of the experience, they implement a healthy diet full of protein."

KARINA PACKS HER DIET WITH FRUITS AND VEGGIES

Professional dancer Karina Smirnoff, 31, is a svelte 110 pounds, but even she has to tweak her diet to get into top TV shape. The 5-foot-5 dancer tells Life & Style she typically has egg whites with spinach and tomato for breakfast, fruit for lunch, and salad and fish for dinner. But her best diet advice? "Listen to your body," she says. "There are foods that your system will digest easily and others it will struggle with. Of course, fruits and veggies are always good."

KELLY FINALLY DROPS THE POUNDS

Fan favorite Kelly Osbourne, 24, says that after years of yoyo dieting, dancing has been the only healthy way she's been able to lose weight. "I do five hours of rehearsals a day -- sometimes even six," she told Life & Style at the 7th Annual Teen Vogue Young Hollywood Party on Sept. 26. The 5-foot-3 star lost 14 pounds in the first six weeks of rehearsals; since then, she's lost even more inches. "My body is completely changing; I'm getting really small in places where I've never been that small before!" Kelly says. "Kelly has cut out late-night snacking," an insider tells Life & Style. She also drinks six glasses of water a day.

MYA ADDS MUSCLE MASS

Mya, 30, has slimmed down -- and toned up! "I lost 11 pounds in four weeks," the 5-foot-5½ contestant told Life & Style at a Humane Society event in LA on Sept. 22. And the singer continues to keep off the weight with occasional twice-daily runs that speed up the metabolism. "My body has gotten more toned," she told Life & Style at the beginning of rehearsal. "I'm seeing a lot more definition, especially in my arms."

DEBI FILLS UP ON H2O

"I've lost 11 pounds, and I've noticed my body toning in weird areas," Debi Mazar, 45, tells Life & Style. Thanks to five-day-a-week rehearsals -- and in spite of a torn neck muscle -- she even notes, "My bra bulge is gone!" The 5-foot-5 actress and cooking-show co-host keeps her energy up with homemade lunches of pasta, fruit and even chocolate, plus "tons of water." Staying hydrated helps prevent fatigue so you can get through your workout.

For more of this season's DWTS' slim-down secrets PLUS how past stars have maintained their ballroom bods, pick up the latest issue of Life & Style, on newsstands now!