The Real Housewives of Beverly Hills star soaked up some sun on Thursday while vacationing in Costa Rica

Lisa Rinna is bringing some fashion — and the heat — to Costa Rica!

While vacationing with her family, The Real Housewives of Beverly Hills star turned up the heat with a sexy bikini photo shared to Instagram.

Rinna, 55, rocked a Fendi string bikini as she posed poolside in her reflective sunglasses on Thursday.

“I got me a Fendi,” she captioned the steamy snapshot, referencing her designer swimsuit which retails for $490.

The mom-of-two also shared another photo of herself to her Instagram Stories, giving her followers a close-up view of her toned abs, cleavage, and sun-kissed skin.

Lisa Rinna
| Credit: Lisa Rinna/Instagram

After sharing her poolside pic, the internet was quick to point out that the 55-year-old’s bikini was the same one model Olivia Culpo, 26, recently posed in on Instagram. And once Rinna spotted their side-by-side comparison, she had one hilarious reaction.

Credit: Olivia Culpo/Instagram; Lisa Rinna/Instagram

TooFab news shared the photo with the caption, “Who wore it better — #OliviaCulpo or #LisaRinna?! 👙We think both look KILLER in this #Fendi bikini.” And the Instagram account, Comments by Celebs, spotted Rinna’s epic response: “We both look f—g awesome. I’m 55 she’s in her 20’s. The end.”

Rinna — who is no stranger to posting snaps of her toned body on social media — recently shared the fitness secrets behind her impressive figure.

Sharing a smiling photo of herself rocking a bright red swimsuit top, Rinna revealed, “I do yoga. 25 years of it.”

“What do you do? Oh and I spin and hike too,” she continued. “Oh and I’m real consistent. Like really.”

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“I don’t love to use the word diet because if I do, I’ll just want to eat 10 times more,” she explained. “Moderation is key.”

Continued the reality star: “I tend to call myself a dirty vegan. I’m mostly plant-based — but if I do need to eat some meat, I’ll have it.”

Lisa Rinna
| Credit: Lisa Rinna/Instagram

As for how she keeps her fit frame? Rinna previously shared that she thinks “it’s really good to move everyday.”

“I really love the combination of SoulCycle and yoga. It keeps me balanced and sane,” explained the former Days of Our Lives star, adding that she works out six times a week by mixing up spinning and yoga classes.

And as she’s gotten older, Rinna said she’s also just found what works for her. “I’ve been my own dietician and workout therapist for years,” she said. “I think you have to listen to your body.”