Can you stay fit by eating right, exercising well and eating cookies? Seems to be working for Brody Jenner. Hey, maybe he's buying into this whole Cookie Diet craze. Or maybe the adrenaline of love is keeping him on his famously-fit toes.

Brody is in love with Playboy's 2008 Playmate of the Year Jayde Nicole. And he couldn't be happier to have put his hard-partying days behind him. Inspired by his gal (she's in amazing shape, he says), the 25-year-old is working out every day and eating healthier than ever before. Well, except for the cookies, which seem to have taken the place of the drinking.

"We stay in, maybe bake cookies," says step-brother to the Kardashian hotties. "It sounds kind of lame, I know – sorry, boys! – but we bake some cookies, watch DVDs and have nice quality home time."