The mother of six posted a mirror selfie on Tuesday, March 25, lifting up her tank top to show off her flat stomach.
"I think I see an ab!!!!" she captioned the picture. "hey after 6 kids I'll take it!!"
The former Real Housewives of Atlanta star, 35, has no problem showing off her ever-changing figure. Just nine days after giving birth, Zolciak posted another mirror selfie with her significantly slimmed-down shape, and her daughter Brielle bragged that she had already gone down to a size 4.
"My belly is almost gone!!!" she captioned the photo.
Zolciak has her fair share of practice when it comes to losing her pregnancy weight. In addition to the baby twins, she and husband Kroy Biermann are the parents of sons KJ, 2, and Kash, 19 months. She's also mom to daughters Brielle, 17, and Ariana, 12, from previous relationships. (Atlanta Falcons player Biermann, 28, recently adopted the girls as his own.)
On a recent Watch What Happens Live appearance, the Don't Be Tardy star told Andy Cohen that her 2-year-old son KJ has a "mouth like a sailor."
"Well, think about having a 17-year-old sister, all of her friends are around him!" Zolciak tried to explain.
"Sweetie, think about having you as a mom" Cohen quipped back.