This will be the reality star's fifth child. In addition to Kash, she and Atlanta Falcons defensive end Biermann, 27, are parents to son KJ, 2; Zolciak also has two older daughters, Ariana and Brielle, from previous relationships.
"Kim loves being pregnant," one insider told Us of the mom-to-be, adding that she's hoping for a sister for Kash. "She really wants a little girl."
Apparently, so does her husband. "Brielle and Ariana are older now, and Kroy wants a girl of his own," the source explained.
Married to Biermann since 2011, Zolciak gushed to Us Weekly in April that motherhood was a breeze with baby Kash. "He sleeps 12 hours and wakes up smiling!" she bragged at a Bravo event promoting her Real Housewives spinoff series Don't Be Tardy, which airs on Bravo on Tuesdays at 10 p.m. "Kash is like the sweetest perfect child on the planet."