Kirstie Alley goes back to Cheers

Kirstie Alley goes back to Cheers, kind of, in a new ad.

A new Jenny Craig ad features Ally and former co-stars John Ratzenberger and George Wendt (known as Cliff and Norm in the show) back at the fictional Cheers bar that was the set for the popular TV show.  The set is actually a recreation of the original set, which was based on an actual Boston bar.

The ad is celebrating the 64-year-old actress maintaining a 50 pound weight loss.

Reuniting with her old costars, was "so much fun,"  Alley told People. 

Watch the ad here:  https://www.youtube.com/watch?v=u8vcdbFKPak