Kristin Cavallari is in the best shape of her life, and her fiance Jay Cutler wouldn't have it any other way. "I'm lucky to have Jay who would rather have a couple pounds on me," the former reality star tells the latest issue of Disfunkshion. "He tells me when I'm too skinny. That helps."

PHOTOS: Kristin Cavallari and Camden's adorable bond

"I take care of myself, go to the gym, eat well," she continues. "There are good and bad days."

VIDEO: Does Kristin Cavallari have a Brody Jenner voodoo doll?

The Laguna Beach vet, 26, and the Chicago Bears quarterback, 29, are parents to son Camden, 8 months. Though Cavallari's pregnancy was unplanned, both parents gleefully stepped up to the plate -- even before their son's August 2012 arrival. "Having Jay is really helpful," Cavallari says. "It's important to talk about parenting philosophies before having a child. You want to go in knowing how to raise them to avoid the arguments that can ensue. Being good parents is our top priority."

PHOTOS: Kristin Cavallari's pregnancy with Camden

Cavallari has made several sacrifices to be a hands-on parent. "Being a mom has definitely changed my priorities. It's all about him," the Illinois-based shoe designer tells Disfunkshion. "I've turned down jobs that would have kept me in L.A. because I want to be there for him."

This article originally appeared on Kristin Cavallari: Jay Cutler "Tells Me When I'm Too Skinny"