PHOTO Kim Zolciak shows off her twins baby bump in lingerie swimsuit

Kim Zolciak announced last month that she was pregnant with twins, and yesterday she showed off her growing baby bump on Instagram!

Going swimming with the kiddos! The pool makes me feel so much lighter! This belly #twins #excited #blessed #nofilter

The twins will make six children with husband Kroy Biermann, who she married on 11-11-11. The couple already has sons Kroy Jr. and Kash, and Kroy has adopted Kim’s daughters from two prior relationships, Brielle and Ariana.

Reality TV cameras (Real Housewives, and their spin-off Don’t Be Tardy) have been with Kroy as he got to know Kim and her daughters, and his relationship with the girls is very sweet. Kim has said that she doesn’t think she could be the kind of step-parent Kroy is: “I don’t know if I could love anybody else’s children as much as Kroy loves the girls. I just don’t know if I have it in me.”

“My daughters are very smart…I didn’t bring everyone around them,” she told E Online about their relationship with Kroy. “I didn’t date a whole lot of people. The relationships I had were long-term, but sometimes my daughters would notice that the person I was dating, they were doing things to kind of win my daughters’ over to get to the mom—it wasn’t genuine. And my girls can see right through that crap. So with Kroy, it was just real…It worked from the very very beginning.”