On Tuesday and Wednesday we caught Kristin Cavallari leaving the gym in Brentwood, and the Hills honey was looking incredibly svelte. I guess that tends to happen when you hit the treadmill on a daily basis, but we're kinda wondering what happened to her!

Doesn't it seem like there's a lot less Kristen than there used to be?

Kristin Cavallari gym brentwood the hills sunglasses