is seen lying face-down on a blue polka-dot towel.
Her skin appears to have gotten very tan from sunbathing.
Brielle later posted a pic of herself as a child, showing how even many years ago she got very tan in the summer.
She commented: "I actually was only going to keep it up until we sold out of our bikini :) never did anything wrong.
"I can't help how tan I get from laying out sun up to sun down at the beach everyday!"
But that didn't stop followers from bashing her.
One wrote: "WITAF is wrong with these tone deaf, hypocritical hillbillies??!
"Feel free to copy pic & share over on @kimzolciak's feed since she blocked me for outing her fake Chanel shoes."
Others wrote: "lol brielle biermann tried it. she really tried it but the comments got so flooded so fast. like girl just embrace being white. i hate being the color of milk too but you don’t see me black fishing.
Another added: "But, why is she so dark? I mean. Girl."
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and her younger sister, Ariana, have been helping to promote her mom and alum new swimsuit company, Salty K.
Earlier this month she flaunted her fit figure in a blue thong bikini.
While showing off the Salty K swimwear, Brielle also let her new brunette locks blow in the ocean breeze.
In June, the new brunette showed off her tanned backside in another thong bikini writing on Instagram: "NEW @saltykswim swimsuit available tomorrow."
Brielle wore her long brunette hair down under a pink bucket hat.
The accessory matched her sunglasses and cheeky baby pink bikini.
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