"We are happy and excited to announce that Yes we are expecting," The Real Housewives of Atlanta star, 32, wrote Monday on Twitter.
The father is Kroy Biermann, 25, a player for the NFL's Atlanta Falcons, whom Zolciak has been dating since May. The pair's first meeting was documented on the Bravo reality show.
Zolciak, who has two daughters from a previous marriage, dodged pregnancy rumors during an appearance Sunday on Bravo's Watch What Happens Live, telling host Andy Cohen she's been drinking tea to preserve her singing voice.
Later in the show, Zolciak showed off her talents during a performance of a new song, "Google Me." Zolciak has said the tune is "kind of like Fergie's 'Glamorous.' "
"Google Me" takes a swipe at a former man in her life. She raps: "You were my world/You, me, and both my girls/Now it doesn't mean a thing/Click them keys, Google me." (Watch the performance below.)
Of course, if anyone Googles Zolciak today, they'll get nothing but pregnancy headlines – confirmation, perhaps, that she's "completely over" her former love.