Kim Zolciak and husband Kroy Biermann have had their second child.

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The Real Housewives of Atlanta star gave birth to her fourth child, a baby boy named Kash Kade, on Wednesday.

"@biermann71 and I are sooo excited to tell you baby Kash Kade arrived today!!! Baby and I are doing great!!!! #soblessed," Zolciak announced on Twitter on Wednesday evening.

"I'm so happy to announce that today we @kimzolciak and I welcomed our 2nd son Kash Kade, Mommy and baby are doing great!" Biermann added in a subsequent tweet of his own.

Zolciak, who also starred in a Don't Be Tardy for the Wedding reality show spinoff for Bravo with Biermann already this year, had revealed she was expecting again in March.

"Kroy and I are so excited... To decide we wanted to get pregnant again and have it happen so quickly was such a blessing," she told Life & Style at the time.

"People are going to be shocked, because nobody knows."

Zolciak and Biermann got engaged in October 2011 and then quickly married a month later. Their first son, Kroy Jagger, was born in June 2011.

While KJ was the first child for Zolciak and Biermann, Zolciak's has two other children from a previous relationship -- 15-year-old Brielle and nine-year-old Ariana.