Lionsgate is backing the project, which stars Sweeney plays Millie, a struggling young woman who is relieved to get a fresh start as a housemaid to Nina (Seyfried) and Andrew (Sklenar), an upscale, wealthy couple. But Millie soon learns family secrets far more dangerous than her own past.

Brandon Sklenar, who recently played a role in It Ends With Us, co-starring Blake Lively, will be seen alongside Sydney Sweeney and Amanda Seyfried in The Housemaid. It is a highly anticipated psychological thriller directed by Paul Feig and produced by Lionsgate.

EXCLUSIVE: Following the box office success of Sony’s It Ends With Us, Brandon Sklenar has found his next high-profile adaptation to star in. Sources tell Deadline that he is set to join Sydney Sweeney and Amanda Seyfried in the Lionsgate adaptation of The Housemaid.

We had earlier reported that Sydney Sweeney and Amanda Seyfried are set to star in a film adaptation of Freida McFadden's popular novel, The Housemaid. The latest update is that It Ends With Us star Brandon Sklenar has joined the cast of the film.

Brandon Sklenar has locked down his next major project, and this time it's opposite Sydney Sweeney. Sklenar — who starred earlier this year as Atlas in "It Ends With Us" with Blake Lively — will star alongside Sweeney in an adaptation of "The Housemaid,