Kim Zolciak-Biermann says she's been open about breast enhancement and tummy tuck procedures because she wants "women to feel beautiful"
Credit: Rob Kim/Getty Images

“It’s frustrating but it’s a battle I’m not going to win,” the Don’t Be Tardy star tells PEOPLE. “People can say what they want to say.”

“I think where people get confused is that I was pregnant for three years,” explains Zolciak-Biermann, 38, who has six children. “I saw a [Real Housewives of Atlanta] clip with Kenya [Moore] saying, ‘Kim looks real different now than when she walked off the show five years ago’ — well, I hope so!”

“I was eight months pregnant with my son [at the time], and I’ve had twins since then,” she continues. “So I look different.”

According to the Bravo star, she’s “the exact same size now” as she was before she had kids.

“People are always like, ‘You’re so skinny now!’ ” she says. “I’m the same exact size, nothing has changed. I’ve aged, so my face has thinned out a little bit. But I have nothing to hide. And also I have nothing to prove!”

RELATED VIDEO: Kim Zolciak-Biermann Wears Nearly Nude Bikini in Snapchat Selfie

Zolciak-Biermann says she documented her breast enhancement and tummy tuck procedures on Don’t Be Tardy to show women that “you can still feel good about yourself.”

“I want women to feel beautiful,” she says. “Just because you’re a mom doesn’t mean you shouldn’t feel beautiful! So I’ve been very open with that. I’ve done my lips. I’ve been open about my wigs. I’ve been wearing wigs for 15 years! I’m not here to hide.”

Credit: Virginia Sherwood/NBC/NBCU Photo Bank via Getty; David Livingston/Getty

FROM COINAGE: The Crazy Cost of a Lifetime of Beauty

But what Zolciak-Biermann won’t stand for is when critics attack her 20-year-old daughter Brielle, who has spoken openly about getting lip fillers.

“I get irritated when they come for Brielle,” she says. “I think people have calmed down about the nose — Brielle’s has not had a nose job.”

Zolciak-Biermann says her 3-year-old daughter Kaia “has the same nose Brielle and I have, basically.”

“Do you think my 3-year-old has had a nose job?” she scoffs. “I’ve posted pictures of my family members — my uncle, my grandmother. And people are like, ‘Oh, she has the same nose,’ — well shocker!”

“The comments of ‘I’m trying to have plastic surgery to look like my daughter’ is a common joke between Brielle and I,” she adds. “Just because she’s my daughter. That doesn’t even make sense to me. I hope that she resembles me!”