Emily Ratajkowski acts.
Emily O'Hara Ratajkowski ( [ ˌrɑːtaɪˈkɒfski ] born June 7 , 1991 ) is an American actress and model . Her feature film debut was as the mistress of Ben Affleck 's character in the 2014 film Gone Girl . Ratajkowski 's 2015 roles included the films Entourage and We Are Your Friends ( her first leading role ) as well as the miniseries The Spoils Before Dying .