The Testament of Ann Lee is a 2025 historical musical drama directed by Mona Fastvold and co-written with Brady Corbet, starring Amanda Seyfried as the 18th-century founder of the Shakers sect. The plot follows Ann's journey from a Manchester cotton factory worker in 1736 to a religious visionary, shaped by the tragic deaths of her four children and a revelation that original sin was fornication, leading her to preach celibacy and claim her role as the female Messiah "Mother Ann." After facing persecution in Britain, she leads her followers to New England aboard the ship Mariah, eventually settling in Niskayuna. The film premiered in competition at the 82nd Venice Film Festival on 1 September 2025, where it received a Golden Lion nomination, followed by a limited US theatrical release from Searchlight Pictures on 25 December 2025 and a UK release on 27 February 2026. Critics praised the film positively, with Seyfried's performance hailed as "career-best," earning her nominations for the Critics' Choice Movie Award and the Golden Globe Award for Best Actress in a Musical or Comedy.