The Real Housewives star looked sensational

Lisa Rinna's fans were left picking their jaws up off the floor after she shared a phenomenal bikini photo on Thursday.

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The 59-year-old looked sensational posing by a beautiful lake in a tiny two-piece that left very little to the imagination. Lisa exposed her cleavage and a hint of her derriere as she leaned forward with her hands on her knees.

WATCH: Lisa Rinna's stunning swimsuit moment on vacation

star's bikini also showcased her long, toned legs and sculpted stomach, with Lisa simply accessorizing with a large sunhat that concealed most of her face.

Fans were blown away by Lisa's photo and rushed to comment on her age-defying appearance. One responded: "So amazing, Lisa! You're always so beautiful!"

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A second gushed: "Yep, you have an amazing body for a person of your age," to which a third added: "Of any age!"

A fourth penned: "Just absolutely 100%. Love you. Thanks for the smile today I truly needed it."

Lisa looked incredible

Lisa marked her 59th birthday in July with a pair of show-stopping swimsuit photos. The reality TV star shared photographs of herself posing on the balcony of her beach house in a barely-there tiger-print two-piece.

"Another trip around the sun. This is 59," she captioned her post with a few beachy emojis. Once again fans were left in awe by how incredible she looked.

One follower wrote: "Are you sure? Ageless Goddess." Another said: "I want to look like you when I'm 59," and a third added: "Happy Birthday my friend for Umpteen years! You continue to defy the numbers!!! Love you!"

Lisa often dazzles fans with her bikini photos

However, Lisa continued to steal the show even after her tiger-print ensemble, opting to share another photo of herself in a white bikini.

This time she opted for a more dynamic pose, going for a half squat and donning a pair of sunglasses and slicked back hair that looked like she'd gone for a swim.

Her fans were quick to comment again, with Justin Sylvester joking she was "50-FINE" and her daughter Delilah writing: "Like how."

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