Kim Zolciak, a former star on the reality show "The Real Housewives of Atlanta," gave birth five months ago, and recently showed off her weight loss in a cut-out swimsuit.

“I’m obsessed with Have Faith swimsuits,” she said on Feb. 20 in a Instagram photo caption.

In August, Zolciak, 34, and her NFL husband, Kroy Biermann, 26, welcomed their fourth child, Kash Kade.

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This isn't the first time she has shown off her slimmed-down physique after giving birth to Kash.

Zolciak was featured in the January issue of Life & Style magazine, where she said, “I’ve lost 30 pounds. I’m only 5 to 8 pounds above my weight before I got pregnant.”

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When asked how she reached her weight loss goal, she said, “I never sit on the couch.”

“I think breast-feeding helped me lose some weight, and I was really busy as soon as I got home with Kash. I went straight into filming my spinoff show, ‘Don’t Be Tardy,’ and I’m sure that helped. I just never sat still!”

Zolciak added that she watches what she eats. “I don’t eat red meat or pork or much dairy, and I always eat in moderation. I’m a size 4 right now, and my goal is to get down to a size 2.

"I’m accepting that I’m going to have to hit the gym — my girls [Brielle, 15, and Arianna, 11] laugh and say there’s no chance, but I really think I’m going to have to.”

Some Twitter followers criticized her for posting the photo.

“Way too old for this. I feel sorry for all her kids,” one user wrote.