The 63 year-old actress is wanting lose some unwanted weight she gained when leaving the weight loss company back in 2007.
The 63 year-old's last stint as a spokeswomen for Jenny Craig was seven years ago, and on Monday (April 7th) it was announced she would be the face of the lifestyle company for a second time.
"I was good for a while and then I wasn't good, and the weight crept up," the actress told People.
"Like I say in the ad, I'm not circus fat. I didn't hugely screw up," she added. "I didn't gain 75. I gained 30."
Alley's first run-in with the company resulted in her losing a total of 75 pounds and maintaining a slim weight of 145 pounds, she was able to keep her new figure for three years before departing with Jenny Craig in 2007.
The 'Cheers' actress admits to finding it hard to maintain a slimmer figure without any guidance, and soon after she began to put the weight back on. This is one of the major reasons why she chose to return to the weight loss company.
"I love that you have a consultant," she said. "It's like being an athlete. No athlete is going to do well without having a coach. We have to equate that to life. Without a coach helping us along the way, I don't think someone can make it for the long haul."
Watch the new Jenny Craig promotional video, featuring Kirstie Alley, below
Alley also appeared on The Today Show on Monday to discuss her new partnership, in which she told host Matt Lauer, "I feel amazing because I feel healthy and I feel happy."
The comedienne also joked that the reason she gained weight was due to "going off the rails," and a combination of "man troubles" and divulging while on vacation.
"Listen, men, stop upsetting your women. You make them fat," the Emmy-winning actress jokingly quipped.
Alley wants to lose 30 pounds as she re-teams with Jenny Craig