updated 09/21/2011 AT 2:30 PM ET
•originally published 09/21/2011 AT 9:00 AM ET
Rock that body, Kirstie!
When Kirstie Alley cleared the 100 lb. weight-loss hurdle this summer, it was time for a big, fat celebration.
“When I hit that mark, I went, ‘That’s it!’ ” Alley tells PEOPLE during her stay in a villa outside Florence, Italy. “I have more energy than I’ve ever had in my whole life.”
While Alley’s weight has famously fluctuated in recent years, the actress, now 60, hit a wall two years ago.