The 51-year-old looked incredible in the photo posted to Instagram of her wearing a sheer lacy bodysuit with a plunging neckline. The TV star showed off the G-string cut and cutout detail at the back as she leaned onto a bathroom sink in front of a mirror and looked behind at the camera.
In another photo, the star relaxed on a couch with her hand buried in her blonde hair, showing off the lacy garment.
Amanda was modelling the Ann Summers Hold Me Tight lingerie from clothing brand JD Williams, which retails for $50, to promote the piece ahead of Valentine's Day.
Fans went wild for the TV star's snap, with many commenting on how incredible she looked in the sheer bodysuit.
"Absolute bombshell," one wrote.
"Fit as hell," another said.
"Don't try and convince me that you're not a goddess," a third added.
"Wow Britain really does have some talent," a fan praised the star.
Others commented on how incredible the TV judge looked at 51.
"You're like a 25-year-old," a fan commented.
"You look better than most 20 year olds," a comment read.
"How come you never seem to age!?" somebody else wrote while a fan begged to know her secret.
Fans however were divided by the sultry snap, with some suggesting it had been photoshopped.
"That's airbrushed and act your age," one savaged the post.
"Makes us normal 50-year-old women feel completely inadequate," another said.
"No cellulite? Not a single stretch mark? Normalise normal bodies!" a third commented.
The lingerie snap comes after Amanda wowed fans in August when she flaunted her incredible figure in a bikini while holidaying in Italy.
The star donned a white triangle bikini as she relaxed on a rock overlooking the clear blue ocean in Sicily.
"How? How do you look so good?" one follower demanded to know.
"Body to die for," another added while a third commented, "This woman is unbelievable".
Never miss a thing. Sign up to Yahoo Lifestyle’s daily newsletter.
Or if you have a story idea, email us at email@example.com.