To celebrate the actor's special day, click through the gallery above to see the cast of Cheers — including Ted Danson, Rhea Perlman, George Wendt and more! — then and now.
Kirstie Alley (Rebecca Howe)
Since winning both a Golden Globe and Emmy Award for her role as Rebecca on Cheers, Kirstie has continued to find showbiz success on TV, starring on Veronica's Closet, Hot in Cleveland, and Kirstie. The mom-of-two has also appeared on reality shows Dancing with the Stars and Fat Actress.