Kirstie Alley 50-Pound Weight Loss Tips & Tricks: Actress Flaunts Slimmer Figure in 'Cheers' Themed Jenny Craig Ad

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Kirstie Alley flaunts her slimmer figure in a new ad for Jenny Craig. The actress mentions her 50-pound weight loss in the 30-second "Cheers" themed commercial. Watch the ad below:

Kirstie Alley is a Jenny Craig spokesperson and in the ad, she goes back to the Boston pub to take up her old role as bar manager Rebecca Howe from "Cheers."

In the 30-second commercial, Alley takes off her coat and said, "Look who's back!"

She was also reunited with George Wendt's Norm Peterson and John Ratzenberger's Cliff Clavin. Both took their character's uniform with Clavin's postal worker uniform and Peterson taking up the same place he occupied in the bar for the full duration of the show.

"Fifty pounds down, thanks to Jenny Craig, declares Alley referring to the weight loss diet program. "I love the yummy food. I don't have to count, track, or worry."

Alley gives Jenny Craig the full credit for her 50-pound weight loss.

"The thing [about Jenny Craig] that works best for me—other than really awesome yummy food, because it really is the best - is that you have a consultant," said Alley to PEOPLE. "Going in every week and weighing in makes you accountable. I'm doing maintenance now, so I only weigh in once every four weeks, but that accountability for someone like me is vital!"

She added that she can eat foods that she want without being deprived because of a diet.

"My favorite food remains chicken fettuccini, and then they have this new dessert, which is chocolate lava cake," she said. "You're supposed to pop it in the oven, but I eat it right out of the freezer! I like it like that. It's dense and yummy."

The magazine adds that Alley quit being a spokesperson for Jenny Craig in 2007 and because of that she gained weight. She came back to the program and she's happy that she did because it worked for her and it made her lose the regained weight.

The actress was a little hesitant at first when people at Jenny Craig asked her to do a commercial inspired by an iconic '80s sitcom. However, when she and her co-stars walked on the set they were amazed to find that it was perfectly recreated just for the ad.

Alley said on NBC's Today that she had so much fun reuniting with her old costars. She said they were "immediately joking around and making fun of everything in the universe."