In the flick, the 45-year-old actress plays the wife of Brad Pitt's detective character, who's investigating a serial killer. Later, she gets murdered and beheaded by 'John Doe,' played by Kevin Spacey.
Taking to her Instagram page, the 'Iron-Man' star posted a photo of herself with her head in a box, sitting in a decorated bathtub with beau Brad Falchuk dressed as Spacey's character from the movie.
The cardboard box on her head is in reference to the film's ending, where Pitt's character finds her decapitated head.
She captioned it with a festive pumpkin emoji.(ANI)