We told you back in December that PEOPLE magazine's 2007 Sexiest Man Alive would plump up for a role in the upcoming thriller The Informant. Sure enough, six months later, Matt Damon is, yes, plump.

Damon estimates that he's put on 20 to 30 pounds -- not to look fat, really, but to look "doughy," he says. Mission accomplished.

How did the Oscar-winner pack on the pounds? Well, he did just what we preach here at That's Fit not to do. He stopped working out and basically ate whatever he wanted.

"I ate a lot of In-N-Out, a lot of burgers, a lot of beer and basically had a great time," he said. A great time it may have been but I bet in no time, this guy will be back in fighting shape, looking more like the photos featured in the gallery below.

More on Damon's expanding waistline in the Bodywatch section of this week's PEOPLE, on newsstands today.

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Is it just me, or are more and more celebrities making the admission that they don't really like to exercise? First we hear that new mom Milla Jovovich "doesn't embrace exercise," and now we're hearing something similar from Christina Aguilera.

In a recent interview with Glamour, Christina admits, "I hate working out -- I have to mentally push myself through it." She works out 90 minutes a day and has a trainer, but she "can't deal with having someone barking" at her, but when she's asked to do something, she just gets focused and gets it done. She's now able to do five pull-ups in a row, as long as she's asked nicely to do it.

Christina gained about 40 pounds in her pregnancy (she had her son, Max, about six months ago), and while she was "OK with the booty and the boobs" after giving birth, she wasn't happy with the weight she was carrying around her stomach. She noticed a big change in her hips as well, and her shoe size went from a five to a seven (it's gone back down now, though -- imagine the horror if she'd had to start over with shoes!). The weight hasn't melted off easily for the diva, but she's regaining her body slowly but surely (and healthfully), and I have no doubt she'll be back to her pre-baby body shortly.

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