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Deny, deny deny! It's been long assumed that Kim Zolciak-Biermann has had plastic surgery to change her appearance, but the reality star is biting back, saying that she's pretty much real from the neck up.

On "Watch What Happens Live," a caller asked Kim if she had work done to enhance her beauty. Kim rolled her eyes during the question, quickly saying, "No. I hear you, and I hear this all the time, but I want people to understand. I had a baby in 2011, one in '12 and two in 2013. So I think the weight of all that...but I mean, no, I haven't."

Host Andy Cohen, though, wasn't buying what Kim was selling, saying he feels that she looks different. Kim has admitted to getting botox and having surgery on her breasts and stomach.

"Here's the deal," Andy said on Aug. 16, "I feel that, you were here, I interviewed you for the Atlanta Housewives 100th episode special. I was staring at your face for a long time, and it was clear to me, that you looked a little different, to me. I couldn't tell and you said 'no, no, no.'"

Andy said that he believes that the "Don't Be Tardy" star had some cartilage shaved from her nose and insinuated that she was wearing librarian-style glasses on his show to hide the surgery. "You've had a little shaved off your nose and your lips are bigger," he said, all of which Kim denied.

"Andy, I'm very honest with plastic surgery," she said. "I've never hid anything, we all know that I do Botox and I'm a big fan of it. My lips are definitely over-drawn."

The host conceded that Kim is usually very open an honest about her past surgeries. "I don't know why you would deny it," he said, "I will say that."

"Yeah there's no reason, I'm very open," Kim said, before Andy added, "but yet, you are a lady who loves a hyperbole and an oxymoron."