Kristin Cavallari gave birth to son Camden Jack Cutler less than 2 months ago, and already has snapped back to her pre-baby weight.

She’s the incredible shrinking woman and we had to find out what she’s been doing to shed the weight.

“Honestly, I don’t have a secret,” Kristin told Hollyscoop at ULTA Beauty’s “Donate With a Kiss” event in NYC, “I’m breastfeeding and that burns 500 calories a day, so that helps.”

She also didn’t use her baby bump as an excuse to stuff her face…