Kim Zolciak Shows Off Flat Stomach in Incredible Bikini Selfies

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Real Housewives of Atlanta star Kim Zolciak has had six kids, but judging from these Instagram pictures she posted Tuesday, getting her bikini bod back has never been a problem for her.

Kim, 36, also went makeup-free in the pics, her hair tied up in a loose bun.

"Obsessed with @beachbunnyswimwear took my boys swimming today! They missed daddy throwing them up in the air and when I attempted to do it ... Well.. Let's just say they didn't go very far!! #nomakeup #natural," she wrote.

Related: It's Twins for Kim Zolciak!

She followed up the jaw-dropping selfie with another bikini pic in a different two-piece swimsuit, claiming that she's "been the same size her entire life."

"Another @beachbunnyswimwear I tried on today!!! Im obsessed with swimsuits! I won't even tell u how many I own!! #beenthesamesizemyentirelife Even after 6 kids!! #grateful #curvalicious," she wrote.

Making the photos even more impressive is that Zolciak gave birth to twins Kaia Rose and Kane Ren just eight months ago, in November 2013.

Related: Kim Zolciak Welcomes Twins!

... Looking good, Kim!