The Real Housewives of Atlanta star and her husband Kroy Biermann "are soooo excited we are having another BOY!" according to a post on her Twitter account.
The couple, who tied the knot on Nov. 11, 2011 and currently appear together on Bravo's Don't Be Tardy for the Wedding, welcomed their first son, Kroy Jagger Jr., in May 2011.
"KJ will have a best friend for life!" Zolciak, who turns 34 on May 19, said in her Tweet.
Zolciak also has two daughters – Brielle, 15, and Ariana, 9 – from a previous relationship.