The "Tardy for the Party" chanteuse tweeted off the birth announcement Tuesday night:
"Kroy Biermann and I are happy to announce the birth of our son today. Kroy Jagger Biermann is healthy & beautiful We are so in love!"
Zolciak, 32, has two daughters, Brielle, 14, and Ariana, 9, from a previous relationship. This is her first baby with fiancé Biermann, who plays for the Atlanta Falcons.
What did dad have to say about his new son?
Biermann, 25, also took to Twitter with an update on the happy family: "Thank you everyone for all of your well wishes!! KJ is doing so well along with momma...Thank you God!!!"
Now they can focus on their other baby. The wig-loving reality star and her footballing beau are reportedly shopping around a reality show focused on their new family.
Good luck with that and congrats on the bambino.