Mariah Carey shows off her new slim self on the cover of Us.

Mariah has never really been overweight, but--like many of us--she has gone up and down over the years. Regardless of her size, she's always seemed so comfortable with it. (Come on, how else could she wear those tiny outfits?)

She chalks up her recent weight loss to water aerobics and avoiding meals that combine carbs and proteins. Water aerobics? We can't exactly picture her at the local Y with the other water ladies, but hey, good for her. Which way do you prefer her: a little junk in the trunk or lean and mean?

Click on an image to view the Mariah: Thick and Thin Gallery!