Sydney Sweeney and Amanda Seyfried have been cast in 'The Housemaid'.The pair have agreed to star in the thriller that Paul Feig is directing for Lionsgate.The picture is based on the best-selling novel by Freida McFadden with the screenplay adapted by Rebecca Sonnenshine.Sydney and Amanda will both serve as executive producers with Feig and Laura Fischer also producing.In the movie, Sweeney will play Millie – a struggling woman who is thankful to have a fresh start as a housemaid to wealthy couple Nina (Seyfried) and Andrew. But she soon learns that the family's secrets are a lot more dangerous than her own.Adam Fogelson, chair of Lionsgate Motion Picture Group, said: "I'm thrilled to have 'The Housemaid' join our upcoming slate."A great filmmaker and a great cast with a great script from a great book is a terrific place to start. My prior work...