In the same year, she starred as Sharon Tate alongside Leonardo DiCaprio and Brad Pitt in Quentin Tarantino's comedy-drama "Once Upon a Time in Hollywood", with Robbie being Tarantino's "first and only choice" to play the late actress. With the threat of the Tate-LaBianca Murders serving as a backdrop, the film tells the story of a fading character actor (DiCaprio) and his stunt double (Pitt) as they navigate the rapidly changing film industry in 1969 Los Angeles. Feeling "an enormous sense of responsibility", Robbie prepared for the role by meeting Tate's family members and friends, watching all of her films and reading the autobiography by Tate's then-husband, Roman Polanski. "Once Upon a Time in Hollywood" premiered at the 2019 Cannes Film Festival to critical acclaim, and was a commercial success with a worldwide gross of $374.3 million. Despite many criticising Robbie's lack of lines in the film, Robbie Collin of "The Daily Telegraph" highlighted a scene with Robbie in the cinema, which he found to be the film's "most delightful" scene.