JANET JACKSON
The star credited her 60-lb. weight loss to five-day-a-week workouts and cutting out white sugar.

CLAY AIKEN
"It's very English gentleman," says hairstylist Steeve Daviault of Aiken's longer locks and spiffed-up style. "He loves wearing Paul Smith suits."

WHITNEY HOUSTON
Two weeks after filing for divorce, the newly blonde star sparkled in Armani. "I feel great," she said.

ASHLEE SIMPSON
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

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