Kirstie Alley definitely deserves our cheers!

The 64-year-old returns to her roots in Jenny Craig's latest commercial, telling former Cheers costars John Ratzenberger and George Wendt how she's managed to maintain her 50-pound weight loss with help from the nutrition company.

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"A moment can change your whole life with Jenny Craig," Kirstie says in the ad as she serves up beers in the show's iconic bar.

kirstie alley

Kirstie in 2010 (left) and 2016.

"I feel really good," the actress recently told Today's Matt Lauer of her transformation. "I have a lot of great things going on in my life and I've managed to keep the weight off, and that's a good thing."

The mother-of-two cut ties with Jenny Craig back in 2007 after packing on some pounds, but has once again become a spokesperson in an effort to keep her figure looking slim.

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"The main thing I realized about myself is I really need to be held accountable for things, because I have a tendency to go sort of wild. Food is one of things where I can go sort of wild," Kirstie explained.

Watch her commercial below:

https://www.youtube.com/watch?v=u8vcdbFKPak

And scroll down to see how her weight has fluctuated over the years!