Entertainment TV Kim Zolciak-Biermann Grounds Daughter Brielle Over Snapchat Butt Shot Zolciak's daughter thought her mother didn't know about Snapchat – she was wrong By Amanda Michelle Steiner Published on January 8, 2015 11:50 AM Share Tweet Pin Email Photo: Fortunata/Splash News Careful, kids – your parents officially know about Snapchat. Former Real Housewives of Atlanta star Kim Zolciak-Biermann busted her daughter, Brielle, 17, for sending a sassy photo of her mother’s backside over Snapchat. The caption? “When ur moms ass is fatter than urs.” Despite the social-media platform’s brief-by-design shelf life, the “Don’t Be Tardy for the Party” singer, 36, caught wind of the photo and posted a screenshot to her Instagram. “Sooooo I’m in MY bathroom trying on some clothes I just got talking with my sweet beautiful [Brielle] and all the while she is taking pics and posting on SnapChat! THIS IS ONE OF THE PICS SHE POSTED!” Zolciak-Biermann wrote on Wednesday. She continued, “So my sweet Brielle is now grounded (she just got ungrounded last week) and now has no phone for a week! #IDontHaveSnapChatSheThoughtIWouldNeverFindOut #IFindOutEverything #IDidLaughThough#SocialMediaStressesMeOut.” Considering the reality star chose to publicize the photo, she can’t have been too upset by it. The Real Housewives of Atlanta airs Sundays at 8 p.m. ET on Bravo.