Kim Zolciak and Kroy Biermann welcome twins

Kim Zolciak attends the 2013 Bravo New York Upfront at Pillars 37 Studios on April 3, 2013, in New York. Getty Images

Kim Zolciak and her husband, Kroy Biermann, are now parents to twins -- a girl and a boy.

The 35-year-old "Don't Be Tardy" star announced the news on Instagram: "Guess what?!!! The TWINS have arrived! We welcomed first a baby girl and second a handsome little boy. They are both healthy, and Kroy and I are so thankful!!"

The proud mom also revealed the babies’ names on Instagram, and it will comes as no surprise to Zolciak fans, that both names start with the letter "K": 

Zolciak and the 28-year-old Atlanta Falcons player are also parents to Kroy Jr., 2, and Kash Kade, who is 15 months. Zolciak has two daughters from a previous relationship: Brielle, 16, and Ariana. Biermann recently adopted the two older girls. 

Zolciak announced the pregnancy news in August, saying, "I can't believe I am going to be a mom to six children," she said. "It's going to be very busy, but it's a dream come true."