"Fat Actress" Kirstie Alley (search) will have to forego that next cheeseburger — now that she's inked a deal to promote the Jenny Craig weight-loss program.

Alley, the formerly svelte "Cheers" star who's ballooned to over 200 pounds, will represent Jenny Craig (search) in its 2005 TV ad campaign.

Alley will star in the company's spots beginning Jan. 10 — two months before the kickoff of her Showtime series "Fat Actress," (search) a "Curb Your Enthusiasm"-type docucomedy about a Hollywood actress (Alley) and her battle with the bulge.

Terms of the deal weren't disclosed, although it's expected that Alley will be paid handsomely for her services. This year alone, Jenny Craig spent over $40 million on its ad campaign, according to Adweek.

"I had a great time getting fat, and now I'm going to have an even greater time losing weight," Alley said. "I had four offers from other companies, but I knew what would work — and, let's face it, Jenny Craig's food is hands-down the yummiest."

The ads will follow Alley as she (hopefully) sheds the weight — her goal is to lose 50 pounds — and viewers will be able to keep abreast of her weight-loss regimen via her weekly blog on jennycraig.com.

This isn't the first time Alley and Jenny Craig have crossed paths. Alley lost 15 pounds on the weight-loss plan 14 years ago and kept it off for 10 years — until a four-year, 70-pound binge that saw her balloon from 130 pounds to 203 pounds.

In a "Dateline" interview that aired Sunday, Alley attributed her weight gain to the cancellation of her last series, NBC's "Veronica's Closet," and the breakup with her live-in boyfriend, James Wilder.

Coincidence or not, Jenny Craig plays a role in the opening scene of "Fat Actress."

In the scene, Alley falls on her bathroom floor, wailing, after stepping on a scale and seeing how much she weighs.

While she's on the floor, her cellphone rings — it's her agent . . . with an offer from Jenny Craig!

The Jenny Craig spots won't be Alley's first time as a commerical spokesperson. A few years back, she starred in a series of ads for Pier 1 Imports.