Leonardo DiCaprio couldn't have higher praise for his newest leading lady. The Academy Award winner teams up once again with director Martin Scorsese for "Killers of the Flower Moon," which adapts the acclaimed non-fiction book that chronicles the horrific massacre of Osage Nation members over oil-rich tribal land in the 1920s. Leo and co-star Lily Gladstone told Access Hollywood's Zuri Hall about bringing such a harrowing piece of American history to the big screen and how they bonded over their common goal to make sure the movie was as authentic to the Osage experience as possible. Lily also confirmed that she never formally auditioned with the Hollywood icon and recalled how surprised she was to find out she'd landed the role before the pair had even read lines together. "They gave me the part and I was like, 'Wait, no, no, we've got one more step!'" she laughed, adding that she "threw the phone across the room" and "screamed." As if that weren't meaningful enough, Lily added that the timing carried particular significance to the story she was about to tell. "That was Dec. 1, and nobody planned it this way but Dec. 1 is Mollie Burkhart's birthday," she said, prompting a "wow" from Leo. "So right away I had the excitement but then it was like, 'Oh, that's a good reminder of what I'm actually here to do,'" she said. "Killers of the Flower Moon" is in theaters now.