The iconic 1980s Hollywood star is unrecognizable in horror movie BTS photos for Halloween. Who is she?

A Hollywood icon from the 1980s and 1990s was completely unrecognizable in an Instagram album she posted for Halloween.

At the height of her fame, she was widely recognized for her thrilling performances – and her fearless attitude to being naked on screen.

This year she broke boundaries again by appearing in a full-frontal nude scene at the age of 61 in a horror film that became a sensation at the Cannes Film Festival.

In honor of the spooky season, she fired up her Instagram page on Thursday to show off a series of behind-the-scenes photos from that project.

Her unmistakable features and her still youthful figure were totally obscured by an old age prosthetic, as well as the occasional fake blood.

A Hollywood icon from the 1980s and 1990s was completely unrecognizable in an Instagram album she posted for Halloween

Demi Moore posted the photos, which were taken on the set of her lively new horror film The Substance, starring her and Margaret Qualley.

‘Have been holding on to these gems from @trythesubstance and today feels like an appropriate day to share them. Happy Halloween from Elisabeth Sparkle,’ Demi wrote in the caption, naming her character in the film.

Bruce Willis’ ex-wife also noted that The Substance had just become available on the streaming platform MUBI that day.

Demi leads the cast of The Substance as Elizabeth Sparkle, a movie star whose career is in decline due to her advanced age.

Elizabeth discovers a liquid called The Substance that she can inject to create a younger version of herself to act in her place.

Sue, played by Margaret, appears as the new youthful version of Elizabeth, who has to shift her mind back and forth between the young and old bodies every week.

However, the process of keeping Sue’s body running causes Elizabeth’s original body to dramatically age extremely quickly.

Since opening in theaters last month, The Substance has earned over $41 million at the global box office, more than double its $17.5 million budget.

Demi Moore posted the photos taken on the set of her lively new horror film The Substance; she is pictured last week at the SCAD Savannah Film Festival

In honor of the spooky season, she fired up her Instagram page on Thursday to pose for a series of behind-the-scenes photos from that project

Her unmistakable features and her still youthful figure were totally obscured by an old age prosthetic, as well as the occasional fake blood

Since opening in theaters last month, The Substance has earned over $41 million at the global box office, more than double its $17.5 million budget

It was met with a similarly glowing response from critics, to the point that it now enjoys an excellent rating of 91% on Rotten tomatoes.

Demi has been known to love the flesh since her ‘Brat Pack’ days, when her sex scenes with Rob Lowe in the 1986 film About Last Night… drove audiences wild.

She has dressed in films ranging from the erotic drama Indecent Proposal from 1993 to the historical novel The Scarlet Letter from 1995 to the comedy Striptease from 1996.

In 1991, she broke ground and ignited a controversy by posing nude on the cover of Vanity Fair while seven months pregnant by her then-husband Bruce Willis.