Kim Zolciak Defies Age By Sharing Skimpy String Bikini Pic On 42 Birthday

Instagram/kimzolciakbiermann

Kim Zolciak Biermann is still " young AF ❤️" and she proved it by showing off her banging bikini bod!

The "Don't Be Tardy" star thanked her millions of fans for all the birthday wishes on Tuesday but perhaps the fans should be thanking her because she hit them with a smoking hot picture. Wearing a pink 2-piece swimsuit and a matching headband, she tugged at her tiny bottoms as she pointed her toes to highlight her gorgeous gams and dangerous curves.

Instagram/kimzolciakbiermann

"Thank you ALL for the birthday wishes! I can’t believe today I’m 42!! Like holy sh** ..that use to be sooo old to me when I was in my 20’s now I know it’s young AF ❤️ ?," Kim wrote in the caption of her post.

She continued, "I’m so thankful to see another year, to spend this time with my incredible husband , 6 wonderful children, my amazing friends, and so many others that bless my life everyday ??."

She is definitely blessed... that's for sure.

Instagram/kimzolciakbiermann

What better way to announce that you have launched your own swimwear line then with a stunning swimwear pic? The reality star is no dummy, so she used her birthday post opportunity to promote her new line while thanking them for the good wishes.

"This last year hasn’t been an easy one and I was so ready to see 2019 go, BUT I’m also incredibly thankful for 2019 as this is the year I decided it was time to chase another dream of mine ?? SWIMWEAR ?," she excitedly shared.

"My love of the ocean and my passion for swimwear is how @saltykswim all started. Available June 1st!
I can’t wait ?."

Instagram/kimzolciakbiermann

It being her 42nd birthday and all, we couldn't help but recall when she shared a shocking throwback to when she was just 16-years-old (that's not her baby).

"My 16 year old self with my cousin Lindsey ❤️ How about those highlights ?," Kim wrote on social media at the time. Her daughter, Brielle Biermann quickly commented on the pic and said, "Gorgeous!!!!"

It's safe to say that she doesn't age (the lip fillers and botox also help).

Instagram/briellebiermann

Her beautiful 23-year-old daughter, Brielle seemed to inherit her mom's love for swimwear because she just recently flaunted her tight bod on the gram as well.

Kim just turned 42 and if we do some quick math (math is not our strong suit) we can determine that she gave birth to Brielle at the age of 19. Maybe that's why they could be mistaken for sisters. Happy birthday, Kim!