Leonardo DiCaprio calls co-star Lily Gladstone the 'heart and soul' of 'Killers of the Flower Moon.' Based on David Grann's bestselling book, Martin Scorsese's sweeping epic portrays a horrific true story known as the Osage 'Reign of Terror.' Lily admits there was some 'initial nerves' working with Leo, but they immediately focused on 'doing justice' to their characters in the complex historical drama. The movie also stars Jesse Plemons, Brendan Fraser and Robert De Niro, who reunites with Scorcese for their 10th film together. These interviews were conducted prior to the SAG-AFTRA strike, which began on July 13. 'Killers of the Flower Moon' is in theaters now.