intro: Call it the "Dancing With the Stars" diet.
It is not uncommon for the celebrity contenstants on ABC's dance reality competition to express hope that the show will do for them what it did for last season's runner-up Kirstie Alley.
Alley, 60, danced 38 inches off her frame and dropped from a size 12 to a size 8 during the show's 10-week season.
The most controversial celebrity tapped for this season's newly announced cast, Chaz Bono, is already dropping pounds while rehearsing for the show's Sep. 19 season premiere.
"He's lost 5 pounds in six days," his professional dance partner, Lacey Schwimmer, told People magazine. "It's so great. He says he's not eating any differently, he's just dancing."
Tune into "Good Morning America" on Tuesday, Sep. 6, to see Chaz Bono and Lacey Schwimmer live, answering questions on everything from Chaz's weight loss to his transgender dancing controversy!
Even before stepping on the dance floor last year, Alley, the former "Cheers" star told Us Weekly that one of her main motives for taking part in the show was to shed pounds.
The show's Season 13 celebrity competitors feel the same way.
"You probably wouldn't know, but I'm the most insecure and overweight I've ever been," Robert Kardashian, Kim's younger brother and star of "Keeping Up With the Kardashians," confessed to Us. "I'm over 200 pounds, so I want to drop weight and this will be a good start."
Ricki Lake, who famously dropped more than 100 pounds, is also hoping to slim down for her upcoming wedding to Christian Evans.
"I fell in love, and I got a little fluffy this year," she told Access Hollywood. "Not a lot fluffy, but like a little fluffier than I want to be. This is definitely time for me to shed the [pounds] for my wedding next year."
Another "Dancing With the Stars" "loser"contender this year is HLN host and legal analyst Nancy Grace, who could look to shed some of the baby weight she gained carrying her twins in 2007.
Watch the two-hour season premiere, Monday, Sep. 19 at 8 p.m. ET and visit abc.com for more information on "Dancing With the Stars" Season 13.
Dancers know that dancing can whip a person into shape.
These stars learned that too, after they appeared on "Dancing With the Stars." Check out the show's big losers -- or winners -- in the battle of the bulge.
quicklist: 1 category: title: Kelly Osbourne url: text:
Kelly Osbourne credits "Dancing" with allowing her to achieve a slim size 2 physique.
Standing next to her former dance partner, Louis Van Amstel, Osbourne told OnTheRedCarpet.com last year, "He changed my life as well as the show did. He got me eating right. He got me working out. He's a huge part of the reason that I changed."
Osbourne lost more than 40 pounds during her time on the reality show in 2009. She did it through a combination of dance rehearsals, additional exercise and change in diet.
After placing third on "DWTS," she posed in a bikini for the cover of Shape. "It was a bit of an emotional roller coaster because I never thought that would be me or I'd ever look like that," she told "Access Hollywood."
media: 14437077 caption: related: 11701085
quicklist: 2 category: title: Jane Seymour url: text: The already-svelte Jane Seymour certainly didn't look as if she had any weight to lose.
But lose she did during her 2007 "Dancing With the Stars" appearance. Seymour shed a total of 20 pounds and packed on some muscle, which helped eliminate her chronic back pain.
"I was 128 before I started, which was heavy for me. That's a good 7 or 8 pounds heavier than I ever like to be. Now I'm 108. And it's all muscle," she told TV Guide after the show.
media: 14437094 caption: related: 11799491
quicklist: 3 category: title: Marie Osmond url: text:
The fifth season was a big one for weight loss.
Besides Seymour, her fellow competitorMarie Osmond shed close to 50 pounds.
Halfway through the season, she told OK! magazine, "I'm down 31 pounds so far. I've lost about 5 inches off my hips and 5 inches off my waist. I've added muscle mass, and I am much more toned. It's incredible. The show should be called 'Dancing With the Starved'!"
Osmond, who was using Nutrisystem's diet plan while dancing, has said she lost a total of 45 pounds while appearing on the show.
media: 14437131 caption: related: 10075942
quicklist: 4 category: title: Jennie Garth url: text:
Jennie Garth also lost weight that season on the show.
The former "90210" star was losing the baby weight gained during her third pregnancy when she started "Dancing With the Stars" rehearsals.
"When I decided to do ['Dancing With the Stars'], I did Pilates three days a week and cardio twice. I hated it, but it helped," she told Us Weekly in 2007. "Once I started dancing, things changed faster than when I was just working out."
Garth said the pounds melted away during six-hour rehearsals. She figured she lost at least 10 pounds, while dropping two pants sizes, going from a size 29 to size 27, while tightening her overall figure.
media: 14437165 caption: related: 11428888