Kirstie Alley's New Life 100 Lbs. Lighter!

By Elizabeth Leonard

UPDATED 09/21/2011 at 02:30 PM EDT • Originally published 09/21/2011 at 09:00 AM EDT

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.

PHOTOS: Hollywood's On-the-Go Fitness Tricks!

"My body had gotten really weak," says Alley, whose weight at that time hovered around 230 lbs. "There was nothing positive about being fat."

By dancing daily after her dazzling appearance on Dancing with the Stars, where she finished second, changing to an organic diet and following Organic Liaison, her own weight-loss program, she's turned her life around.

"I feel back to normal," says Alley, now a proud size 6. "I have my game again."

And she's ready for her next challenge: "What I'm looking for is to be madly, deeply in love," says Alley, who will also star in the upcoming ABC pilot, The Manzanis.

"For the first time in my life, I know exactly what I want in a man," she says. "I want someone who has my back, who is courageous and brave."

For further details on Kirstie's new life 100 lbs. lighter – and for PEOPLE's outrageous photo shoot of the star in Italy – pick up this week's new issue of PEOPLE, on newsstands Friday