Bravo's reality series "Don't Be Tardy" is about to gain one more cast member. Former "Real Housewives of Atlanta" star Kim Zolciak is expecting her third child with husband and NFL star Kroy Biermann, a new report is claiming Wednesday.

According to In Touch, the 35-year-old reality star revealed her growing belly during a recent family beach vacation. The pregnancy will make it the fifth child for Zolciak, the second in less than one year. Zolciak and Biermann, 27, welcomed their first child as a couple together in 2011, Kroy Jagger Biermann Jr., known as K.J., now 2. Zolciak had her last child, Kash Biermann, nine months ago.

"Kim and Kroy are so excited to be pregnant again," a source told the magazine. "She's been trying to keep it quiet. She didn't realize she's showing as much as she is. … They didn't plan it, but they're thrilled."

See the photos of Kim Zolciak's pregnant beach body here.

The pregnant star already has 16-year-old Brielle Zolciak and 11-year-old Ariana Toce, both with former flames. In Touch reported that Biermann, a defensive end for the Atlanta Falcons, is currently in the process of trying to adopt both minors.

On a recent episode of "Don't Be Tardy" the couple revealed plans to conceive a third child within the next year. Zolciak confessed she wanted to delay her next pregnancy since she was not interested in having three children under the age of 2.5 out of fear of needing vaginal rejuvenation.

The couple also expressed their desire to have a girl after the two boys, the reality star even looking up specific rumored techniques on how to conceive a female on the program. "It's very easy for me to get pregnant, clearly," said Zolciak. "We're married. We can just keep having babies. What's the big deal?"

"Don't be Tardy" airs on Bravo Tuesday's at 10 p.m. ET.

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