Kirstie Alley is getting back in shape with a new Jenny Craig partnership Credit: Robin Marchant/Getty Images

Former Fat Actress star Kirstie Alley is on a mission to get slim! 

Alley, 63, announced Monday, April 7, that she is joining Jenny Craig again, a decade after she worked with the weight loss company in 2004. The first time around, the Cheers star dropped 75 pounds with the diet program, a total much higher than the number she is going after now. 

"I'm not like, circus fat," Alley says in a new ad campaign for Jenny Craig. "I just want to lose 20 pounds," jokingly adding that she might shoot for 30.

Kirstie is serving as a spokesperson for Jenny Craig after ending her initial agreement with the company in 2007. She shows off her physique in a form-fitting dress in a newly unveiled commercial, where she praises the brand, complimenting the "yummy" food and personal consulting.

Alley, who has long been vocal about her struggle with weight loss, appeared on The Today Show Monday morning to discuss the partnership, telling host Matt Lauer, "I feel amazing because I feel healthy and I feel happy."

She went on to explain her return to Jenny Craig, adding that she maintained her weight loss for four years before going "off the rails" due to "man trouble" and holiday indulgences. 

The funny woman has used her weight as a subject of humor in the past, poking fun at her changing body in the A&E reality show, Kirstie Alley's Big Life and her Showtime series, Fat Actress.