From PEOPLE Magazine Click to enlarge
When Jason Alexander became the new spokesman for Jenny Craig, his wife, Daena, asked, "If this doesn't work, aren't you nervous about being humiliated?" Alexander's reply: "Honey, I've made a career out of being humiliated!" Lucky for Daena, she's got nothing to worry about: Since the actor—best known for playing the rotund and neurotic George Costanza on Seinfeld—started the weight-loss program five weeks ago at 195 lbs., Alexander, 50, has dropped about 14 lbs. "My younger son [Noah, 14] has a nickname for me: SFB—short, fat, bald," says the 5'5" actor, whose goal is to lose 30 lbs. "I said to him, 'You're going to have to make it just SB pretty soon!'" Along with working out five times a week, Alexander—who currently stars in the one-man show The Donny Clay Experience in Las Vegas—drastically cut his diet down from 4,500 calories a day ("Twinkies were one of my favorites") to a 1,500-calorie daily meal plan heavy on fruits and vegetables. Now that his waistline is 2 in. smaller, "I have to use suspenders on most of my pants," he says. "That American Idol song 'Pants on the Ground?' That's me."

NOW 181 LBS.

PRETTY WOMAN, 1990

SEINFELD, 1992

"I've been struggling with weight my whole life," says Alexander (with Julia Roberts, above). But since Seinfeld ended, "the industry has typecast me as George," he says. "By getting this weight off, the impression of me will change. I'd be happy to have that."