"Shopping for bikini season!" the 27-year-old former Miss Alabama captioned the ab-flaunting photo. "Shameless selfie...but seeing progress just from breastfeeding. Pretty awesome how the body works! #1monthpostpartum."
Katherine also had a message for those who would inevitably criticize her body or accuse her of bragging about her weight-loss, writing, "Note: I gained 44 pounds during my pregnancy, so this post isn't meant to be 'humble'. Say what you want, but I feel great about myself even with the extra cellulite on my butt and stretch marks so shoot me if I felt banging for once in this bikini..okkkkk"