How Kristin Cavallari Lost Baby Weight McMullan/Sipa USA/Newscom Kristin Cavallari showed off her supertrim post-baby body earlier this week and shared her secret of how she got back into shape so quickly: a healthful diet and no alcohol. "I'm like a freak about eating healthy," the 26-year-old former "Hills" star told Us Weekly at the launch of her new jewelry collection for Glamboutique in Los Angeles. I've always been a really healthy eater. I think when I got pregnant I took it up another notch, just because I was so aware of what I was putting in my body. I've just maintained that since I've had Cam. And honestly, I rarely drink alcohol, which helps too. It's just empty calories. Celeb Moms Battle Baby Bulge Cavallari and fiance Jay Cutler, the Chicago Bears quarterback, welcomed their first child, son Camden, in August 2012. The new mom admits she doesn't completely deprive herself, giving into occasional sweets, and even fast food. Kristin Cavallari and Jay Cutler Welcome Baby Boy "I have a huge sweet tooth, but I'll get dark chocolate with caramel," she explained. Or there's an ice cream at Whole Foods called Coconut Bliss, which is made out of coconut milk, and so, to me, that's not really cheating. As for the fast food, she shared, "There's a place called Portillo's in Chicago, which is fast food [and] has the best burgers. So we've had that I think twice this year. But that's a lot of fast food for me in that short amount of time.