Bravo reality star Kim Zolciak is pregnant with her fifth child.

The Real Housewives of Atlanta star is expecting with her husband Kroy Biermann, the 27-year-old Atlanta Falcons defensive end whom she married in 2011.

The reality star is expecting just nine months after she gave birth to their second son, Kash Kade. The couple has another son, K.J., almost 2, and Zolciak also has two pre-teen daughters from a previous relationship - Brielle and Ariana.

A friend of the Don't Be Tardy stars reportedly told InTouch that she's pregnant and has been trying to keeping it quiet. According to the source, Zolciak's baby bump was visible in a white bikini while in Destin, Fla., during Memorial Day weekend.

"She didn't realize she's showing as much as she is," said the insider.

Although the happy couple already have four children, they are excited to add another little one to their growing brood.

"Kim and Kroy are so excited to be pregnant again," said the friend. "They didn't plan it, but they are thrilled."

Zolciak also has a preffered sex in mind for their third child- "she's hoping for a girl."

During an exclusive video interview for Us Weekly in April with her husband, Zolciak said that she would like to have another girl.

"We may try for a little girl but if we have a little boy and that's what God thinks that's what's perfect for our family then so be it," she told the camera. "This one would have ten kids but probably we'll try for one more and then, that'll probably be it."

Watch Zolciak say that she wants to have another daughter in the video below.

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