Zolciak, 35, posted a picture of her belly on Instagram Sunday, with the caption: "Sooooo with all the request I finally decided to post My baby bump today! The twins will [be] here this month and we are soooo excited and I'm soooo over being pregnant! #countingdownthedays."
The twins, whose sexes are unknown, will be Zolciak's third and fourth children with her husband, Atlanta Falcons player Kroy Biermann. Their sons, KJ and Kash, are 2 years and 1 year old, respectively.
Zolciak also has two daughters — Brielle, 16, and Arianna, 12 — from previous relationships. She's indicated that the twins will be her last children.