Josh Lucas has joined the cast of Warner Bros. romancer “Life as We Know It” alongside Katherine Heigl, Josh Duhamel and Christina Hendricks.Greg Berlanti will direct, with Barry Josephson and Gold Circle topper Paul Brooks producing. Project, penned by Ian Deitchman and Kristin Rusk Robinson, follows two unattached adults whose worlds are turned upside down when their mutual best friends die in an accident and name them as caregivers of their orphaned daughter. Heigl and her mother Nancy Heigl are exec producing. Lucas is shooting “Little Murder” with Terrence Howard. He recently starred in “Peacock” with Cillian Murphy and Ellen Page and with Jon Hamm in “Stolen Lives,” which Lucas produced.