Associated Press
| November 26, 2012

Jessica Simpson is looking lean and mean after losing 60 pounds of post-pregnancy weight, and it's all thanks to eating right and exercising. Oh, and a few million dollars.

READ: Jessica Simpson Instagrams Skinny Photos

Five months after reportedly inking a multi-million dollar deal to be a spokeswoman for Weight Watchers, Simpson is flaunting her slimmed-down bod for the upcoming commercials and posting pics of herself on her personal Twitter page.

But Simpson isn't the first celebrity to get skinny with the help of a weight loss program. Plenty of portly celebs have joined similar systems for their much-needed motivation (and in some cases, money) to get moving. 

Here are eight more famous faces who served as spokespeople for weight loss companies.

Associated Press
Kirstie Alley

Kirstie Alley served as a Jenny Craig spokeswoman from 2005 to 2008. More recently in 2010, she founded her own weight loss program called Organic Liaison.

READ: Kirstie Alley Talks About Her Cocaine Addiction

Valerie Bertinelli

Kirstie Alley brought Valerie Bertinelli on board as a Jenny Craig ambassador in March of 2007. Less than two years later, she was posing in a bikini on the cover of People magazine.

Jennifer Hudson

After being called "the big girl" when she was a contestant on "American Idol," Oscar-winner Jennifer Hudson slimmed down with the help of Weight Watchers, for whom she became a spokesperson in April of 2010.

WATCH: Jennifer Hudson Talks About How Her Weight Loss Is Saving Lives

Marie Osmond

Currently a spokesperson for Nutrisystem, Marie Osmond credits the weight loss program with helping her shed 50 pounds.

Jason Alexander

Reportedly inspired by the success of pal Valerie Bertinelli, the "Seinfeld" star signed on as a Jenny Craig spokesman in 2010.

READ: Seinfeld Imagines What A 'Seinfeld' Reunion Would Look Like

Mariah Carey

Following the birth of her twins in 2011, the songstress signed on with Jenny Craig and shed 30 pounds.

Sarah Ferguson

After struggling for years to lose her post-pregnancy weight while the British tabloids called her "the Duchess of Pork," Sarah Ferguson, the Duchess of York, became a spokeswoman for Weight Watchers in 1997.

Charles Barkley

Charles Barkley is the face of Weight Watchers' "Lose Like a Man" ad campaign. While on the program, the former NBA star reportedly dropped 42 pounds from his 6-foot 6-inch frame.