08/19/2013 AT 04:00 PM EDT
Kim Zolciak is now eating for three!
The Don't Be Tardy star
revealed on Monday that she is expecting twins.
Already the mother of four other children
, Zolciak, 35, told E! News
that she "couldn't be more excited" about adding two more little ones to her brood.
"I was completely shocked," she said. "I had no idea. It was a natural conception, but twins do run in the family, so I guess I shouldn't have been surprised."
Zolciak, who is married to Kroy Biermann, added of their big family, "I can't believe I am going to be a mom to six children. It's going to be very busy but it's a dream come true."
Just before re-Tweeting E! News
's congratulatory message, Zolciak teased on Twitter
that she had a "VERY exciting and personal announcement!!!"