Kim Zolciak posts totally topless photo on Instagram

Kim Zolciak-Biermann is letting it all hang out!

The unapologetic "Don't Be Tardy" star took to Instagram on Thursday to celebrate the fact that she has reached 2.5 million followers on Instagram with, naturally, a totally topless photo of herself.

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In the picture, the 39-year-old reality TV maven is shown from behind as she's walking into the ocean in a giant white skirt without a top on. With her hands up in the air and her signature blonde blocks hanging down her back, the star clearly doesn't care who's watching the racy moment.

See the photo -- and more from her vow renewal -- below:

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Kim Zolciak's vow renewals in Turks & Caicos
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Kim Zolciak's vow renewals in Turks & Caicos
Hands up🙌🏼 THANK YOU for 2.5 million!! 😍😍 I appreciate all of you! I loving getting feedback (most of the time) from you guys. You guys keep me up to date with all things I miss. I love reading your comments/stories. Thank you for sharing in this journey (with me) we call "life" 💋
I am the LUCKIEST wife/mother on this planet! I never will ever take my family for granted! God is so good!
Life is but a dream ❤️
I'd go to the end of the earth for you ❤️
First for everything!! ❤️ dress by @leannemarshallofficial photo credit: my hubby
Love, Happiness, Peace, And Joy. ❤ dress by @leannemarshallofficial
❤❤❤ my boys 5, 4 and 3 yrs old!
Couple of my boys ❤❤ @kroyjaggerbiermann @kroybiermann
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"Hands up🙌🏼 THANK YOU for 2.5 million!!" she captioned the picture. "I appreciate all of you! I loving getting feedback (most of the time) from you guys. You guys keep me up to date with all things I miss. I love reading your comments/stories. Thank you for sharing in this journey (with me) we call 'life.'"

The photo comes from Zolciak's recent wedding vow renewal with husband Kroy Biermann. Along with her six kids, Zolciak had a talked-about photo shoot to honor the occasion. She had previously posted a handful of other photos from the picturesque night.

The Bravo star is no stranger to showing skin on social media, so her latest boundary-pushing post shouldn't come as a surprise to people familiar with the star.

RELATED: See celebrity nude shots from 2017:

33 PHOTOS
Celebrity nude shots in 2017
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Celebrity nude shots in 2017
tock
🌺🌸🌹🌸🌺🌹
i don't smoke
Another day at the office 😛♥️
in Eutopia 🌬🦋💙
Mikey made me do it ... Miami nights 🙌🏻 1. This is my pre DWTS body🦄 2. I am not currently in Miami but am in NYC 3. I posted this knowing most of you would be judgmental and couldn't resist a chance to tear me down and I was right. 4. Go be offended at your own life. 5. I'm living my life to the fullest. ❤️
Just wanted to share that one of the reasons @eatingboys has inspired me so much is because of the way she mixes her humor and sexuality. I spent so many years loving my body but thinking it wasn't lovable by others- its sole purpose was to be fodder for jokes. I performed the insult so no one else could. I don't regret any of it- that's my art and that was my truth- but now, at age 31, having been through hell and back with my health and other people's perceptions of my physicality, I feel deeply comfortable with the idea that this pear-shaped pot of honey is equally good for making people laugh and laying out like a Suicide Girl circa 2004. Love it all.
mother nature
Amore mio
I’ll tell you what freedom is to me. No fear. #NinaSimone
Gold 💛
Something special today 🖤
playing dress up
birthday suit
La Sirena
Mid fitting nap time 😈
Cheers to @playboy for going back to nudes. The female body is so beautiful, every size and every age. Be proud! #thefemalebodyisbeautiful #allshapesandsizes #loveyourself #loveyourbody
I'm very proud to be a part of the March/April issue of Playboy. I penned a short essay along with my pictorial titled, "The Feminist Mystique". A big thank you to @Playboy, the creative team, and @cooperbhefner for such a unique opportunity. #NakedIsNormal
NYC//bed series
Loving you so far 2017. ✌🏻
Thank you @fsseychelles for your outdoor showers, beautiful hospitality, delicious steaks and flying foxes! Shot by my exclusive shower partner @mrjustinervin💦
Nap time = The Best Time 😇🙌🙌
The mystery about my panties... solved! 😂🤣👏🏻. Can u see 🤓 me now?! Lol . The jokes on u🙃🥂 #opticalillusion
🛀🏾🍷🎁 That's what's up #NewSong #NewVideoAlert #BirthdaySong! 🚨🚨 👉🏽#gratitude! Feeling so grateful today! #LinkInBio
Just a typical press day with @mj_day for the launch of @si_swimsuit 2017!!
Simplicity
Angela
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