Brian Doben / Jenny Craig / Promotional 1 / 12
Brian Doben / Jenny Craig / Promotional 1 / 12

Kirstie Alley already has cause to celebrate in 2016. The "Cheers" alum, whose path to achieving her ideal body has been a decade-long rollercoaster, lost 50 pounds between April 2014 and January 2015 -- and she's managed to keep off the weight for a full year!

But that doesn't mean her weight-loss journey is over.

"I might have interest in going down like 10 more pounds," she told on Jan. 7 after unveiling her latest ad campaign for Jenny Craig, in which she reunites with "Cheers" co-stars John Ratzenberger and George Wendt. "And then that would definitely be the end."

Just don't expect to see her on a treadmill anytime soon!

"I'm not gonna go in a gym," she told us. "That's not gonna happen."

The "Look Who's Talking" star attributes her new bod to her active lifestyle, which includes yoga, dancing and riding her bike instead of driving -- "I was riding my bike around places because it was actually really fun and then [my friends] would ride their bikes with me, and it sort of became this social thing that I really liked," she said.

And she plans to make fitness an even bigger priority moving forward: "This year, I want to incorporate more exercise [into my life]," said Kirstie. "Fitness is sort of a fun goal for me this year -- and finding new, different ways to work out. … I love to dance and I think if a coupe nights a week I went out to some salsa club and just danced for four hours, that would be fun."

But technically, the "Big Life" star has already accomplished more than her original weight-loss goal.

"When I first started [doing Jenny Craig again], I was going to lose 30 pounds," said the "Veronica's Closet" alum, who's worked with the company off-and-on for more than a decade. "I lived with that for three or four months, and then I went, 'You know, I want to keep going.' So then I lost 50."

It's a huge achievement for the 64-year-old, who starred in campaigns for Jenny Craig in 2004 and 2007, launched her own weight-loss program, which she eventually sold to Jenny, and then lost 100 pounds while competing on the 12th season of "Dancing With the Stars" in 2011 -- only to gain back the weight each time.

(See her transformation from heavier in 2010 to slim following her appearance on "DWTS" in mid 2011 and back to heavier by 2013.)

"When I gained weight again, it was like I really let everyone down -- the entire universe," Kirstie said of her past tendency to fluctuate in size. "I let people down, so now for me and for them, I need to show that I can get back on the horse."

"I was really deciding how I want to spend the rest of my life," she added. "Do I want to spend the rest of my life losing and gaining weight?"

The answer to that question, apparently, is a resounding no!