Robbie, who plays Sharon Tate in the film, stunned in a white dress by Chanel that was paired with a gold chain purse.
Set in 1969 Los Angeles, the blockbuster sees DiCaprio play fictional actor Rick Dalton and Pitt as his stunt double, Cliff Booth, as the pair attempt to navigate the evolving Hollywood film industry.
The comedy-drama also depicts several famous faces of the era, including actor Steve McQueen (Damian Lewis), serial killer Charles Manson (Damon Herriman) and actor Sharon Tate (Robbie).
On the set of the film, some crew members were reportedly urged not to look Leonardo DiCaprio in the eye.
A source from the set of Quentin Tarantino’s sprawling Los Angeles drama told The Hollywood Reporter that some crew members were “instructed to avoid making eye contact” with the Oscar-winning actor.
However, sources close to the actor have since told Metro.co.uk that there’s no truth to the allegations.
Launch the gallery below to see more photos from the premiere.