Kim Zolciak-Biermann Celebrates Her 40th Birthday in a Thong Bikini

This is 40 ... wow!

By Adele Chapin May 22, 2018, 10:53 AM ET

Kim Zolciak-Biermann's Style Evolution

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Dorit Kemsley's Many Hairstyles

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Style Muse: Brittany Cartwright

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Teresa Giudice’s Style Evolution

Kim Zolciak-Biermann is always fashionably on the go, whether she's flashing her abs in Miami or wearing the hottest Jimmy Choo designer shoes to walk the tarmac. (Watch the video above to see her style evolution throughout the years.)

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But to celebrate her big 40th birthday this week, the Don't Be Tardy beauty kept things very minimal while on a tropical getaway. Minimal, as in she wore a very tiny white thong bikini while hanging out in the surf. Curves ahead!

"These last 48 hrs have been a dream! Party with Family and friends and now the beach for a short getaway. #ThisIs40Baby #YouAreWhatYouThink," Kim wrote in the caption of one of her beach Instagram photos.