“OMG!!! i’m so excited my mom is PREGNANT with baby number 7!!!!” Brielle, 20, wrote in the tweet.
She shared her tweet on Instagram, where she wrote in the caption, “OMG!!!! i can’t wait to meet the little nugget inside. it’s been so hard keeping this a secret!!! wooo!! #lucky7.”
The Don’t Be Tardy star, 39, went on Snapchat a few minutes later to deny it, telling her followers, “Brielle’s lying! She’s lying.”
Zolciak-Biermann is married to football lineman Kroy Biermann, 32, and has six kids: Brielle, Ariana, 16; Kash Kade, 5; twins Kaia Rose and Kane Ren, 3; Kroy Jr., 6.
Brielle also tweeted at a fan that her mother was “due in the spring sometime!”
Despite not being pregnant, the returning Real Housewives of Atlanta star, confessed on Watch What Happens Live with Andy Cohen in early October that she had baby fever.
“I have baby fever so bad,” the reality star shared as Kroy, who was with her, said, “Never say never.”
Though the NFL player underwent a vasectomy in January 2014, his wife shared the medical procedure is “easy to fix.”
“I want another boy, really bad,” Zolciak-Biermann said about missing “breastfeeding and snuggling” a newborn. “I fantasize about it but I’m happy with what we have,” she added.
“He’s raised little men. Every Monday night, the garbage they take out – all three of the boys. They treat me like a queen – all three of the boys. He’s an incredible dad,” Zolciak-Biermann gushed of her husband’s parenting skills.
While the father of six is the disciplinarian out of the two, he complimented on his wife’s maternal side.
“They’re sensitive, they’re in touch with their emotions, they communicate very well. They express their feelings very well. All that comes from her,” Biermann said.
This article originally appeared on PEOPLE