12/25/2006 at 01:00 AM EST
The star credited her 60-lb. weight loss to five-day-a-week workouts and cutting out white sugar.
"It's very English gentleman," says hairstylist Steeve Daviault of Aiken's longer locks and spiffed-up style. "He loves wearing Paul Smith suits."
Two weeks after filing for divorce, the newly blonde star sparkled in Armani. "I feel great," she said.
Simpson stepped out with a noticeably more sculpted profile—and a sexier wardrobe—this summer.
Weigh in with your own opinions on the year's big celeb transformations at OFFTHERACK.PEOPLE.COM