Kim Zolciak proudly showed off her growing baby bump on her Instagram page before heading out for a day at the pool with her family, the Daily Mail reports. The "Real Housewives of Atlanta" star posed in front of the camera wearing a sexy black and white bikini as she showed off her protruding belly.

"Going swimming with the kiddos! The pool makes me feel so much lighter! This belly #twins #excited #blessed #nofilter," she captioned the photo.

Zolciak revealed that she expecting twins in August to E! News telling the celebrity website how shocked she was when she found out.

"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. 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."

The 35-year-old found out she was expecting for a fifth time on her reality TV show "Don't Be Tardy." She told E! that she took over a dozen pregnancy tests to make sure it wasn't a false alarm because she had just given birth to her second son nine months before.

"Pregnant, pregnant, pregnant, pregnant, pregnant, pregnant," she read the results to Biermann on the show. "Kroy, we have not one negative test."

Clearly excited she hugged her football husband adding "You did it again, lovey... Are you excited, love muffin? It must be the athlete sperm."

Zolciak has decided not to reveal the sex of the babies but she has often said on her show that she would like to have more girls.

Zolciak and Biermann, who married in 2011, already have two children together, Kroy Jr., 2, and Kash, 1. She has two daughters from a previous relationship Brielle, 16, and Ariana, 11.