ET's Lauren Zima talked with Theron at the grand opening celebration of real-estate developer Rick Caruso's new Palisades Village retail center in Pacific Palisades, California, on Thursday, and she explained what drew her to the upcoming untitled Charles Randolph film.
"I think it's an important story," Theron shared. "It was written really well, and I think it was the writing, and the filmmaker, that made me realize it was in the right hands."
"We need to tell these stories, for sure," Theron explained.
The celebrated actress is among a number of big-name stars who have signed onto the project, including Nicole Kidman -- who is set to play Gretchen Carlson -- as well as Margot Robbie, Allison Janney, and John Lithgow, in the role of Ailes.
The project is currently in pre-production, and there's no word yet on when it's expected to hit theaters.