For the new film, which is titled The Eyes of Tammy Faye, Chastain has transformed into the TV star – a process that took her four hours every day.
The actor is playing Tammy Faye, a TV evangelist who found fame among religious communities with The PTL Club, a show she presented with her husband Jim Bakker in the 1970s.
Jessica Chastain is the latest Hollywood star to undergo a radical transformation for a movie role.
The film, based on the documentary of the same name, will be released in September 2021.