Credit: Photo via Instagram Photo: Brielle Takes a Bikini Selfie

Real Housewives of Atlanta child star, Brielle Zolciak, is hardly a child anymore. The teenager, who celebrated her 16th birthday at the beach with her family, took this cute selfie wearing an itty-bitty bikini. Look at that flat tummy! We're dying of jealousy over here.

She also posted a picture of herself paddle boarding. That's one way to get in your ab workout while on vacation!

Her killer body isn't that surprising considering her genes. Mama Kim Zolciak is looking absolutely amazing after four kids, including two back-to-back boys over the last 18 months. Either she's got a kick-ass personal trainer or those mummy wraps really do work.

Do you think Brielle takes after her mom? Weigh in below.