'Real Housewives of New York' star Carole Radziwill flashes breast in racy Instagram

Carole Radziwill is looking fab at 54 -- and her beau thinks so, too!

The "Real Housewives of New York" mainstay celebrated her 54th birthday on Sunday, and her on-again off-again boyfriend, Adam Kenworthy, used the occasion to show off more than a little of his ladylove's fit physique, with two fun Instagram shoutouts.

SEE ALSO: John Stamos bares all for his 54th birthday: See the racy naked pic!

The first one shows Radziwill standing on a dock in white bikini bottoms and a rash guard unzipped in the front. The photo shows her flaunting her bare chest, though Kenworthy helped Radziwill cover up just a tad by playfully placing a pink star emoji over her breast.

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HBD @caroleradziwill 🎉❤️#54

A post shared by Adam Kenworthy (@adamkenworthy) on

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HBD ❤️ @caroleradziwill 🎂 👑

A post shared by Adam Kenworthy (@adamkenworthy) on

In another photo, Radziwill is notably more covered up, rocking a simple white coverup and the same sunhat and glasses combo she's rocking in the other shot.

See photos of Carole and Adam together:

Carole Radziwill and Adam Kenworthy together
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Carole Radziwill and Adam Kenworthy together
NEW YORK, NEW YORK - APRIL 12: Journalist, author, and reality television personality Carole Radziwill and Adam Kenworthy attend the 2016 Breast Cancer Research Foundation Hot Pink Party at The Waldorf=Astoria on April 12, 2016 in New York City. (Photo by Gilbert Carrasquillo/FilmMagic)
THE REAL HOUSEWIVES OF NEW YORK CITY -- 'Say It Ain't So' Episode 820 -- Pictured: (l-r) Bethenny Frankel, Adam Kenworthy, Carole Radziwill -- (Photo by: Heidi Gutman/Bravo/NBCU Photo Bank via Getty Images)
WATCH WHAT HAPPENS LIVE -- Pictured (l-r): Carole Radziwill, Adam Kenworthy and Mercedes 'MJ' Javid -- (Photo by: Charles Sykes/Bravo/NBCU Photo Bank via Getty Images)
WATCH WHAT HAPPENS LIVE -- Pictured (l-r): Andy Cohen, Mercedes 'MJ' Javid, Carole Radziwill and Adam Kenworthy -- (Photo by: Charles Sykes/Bravo/NBCU Photo Bank via Getty Images)

The birthday snaps come just a week after the pair sparked breakup rumors. It's unclear what their relationship status is at the moment, though it's encouraging that Kenworthy called attention to Carole's birthday in such a public way.

Radziwill and Kenworthy have been dating for the past few years, after they met at "Real Housewives of New York" cast mate LuAnn de Lesseps' house in the Hamptons, where he was working as a private chef. The pair moved in together, though Kenworthy moved back out during the current season of the Bravo hit.

Radziwill was previously married to Anthony Radziwill from 1994-1999, before he lost his battle with cancer at the age of 40.

See more celebrity nude shots from 2017:

Celebrity nude shots in 2017
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Celebrity nude shots in 2017
Same butt different 🧡
comfortable in my rolls. fuck wit me.
Happy day of birth to my son, my whole heart ❤️
So honored to have been photographed by Mert and Marcus for their book new book! 20 years in the making! It's out Sept 7th #mertandmarcus @mertalas @macpiggott #taschen
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
Hot dog dog. Thanks for chiming in on what you feel I deserve to be paid. I believe women deserve equal pay. However I don't believe I deserve equal pay to Chris and Dave. They are legends and 2 of the greatest comics of all time. I would like to say that I have been selling out arenas these last couple years. Something a female comic has never done. That's a big deal to me, especially because I know I do my best every night on stage for the audience and they have a good time. I didn't ask for the same as my friends. I did ask for more than the initial offer. I will continue to work my ass off and be the best performer I can be. The reports of me "demanding" or "insisting" on equal pay to them aren't a true. #fat #stealsjokes
#54 and clean. Thanks for the birthday wishes!
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 😈
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!!

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