Cannes 2019: Margot Robbie, Brad Pitt, Leonardo DiCaprio steal the show on day 8

Once upon a time...

Margot Robbie, Brad Pitt and Leonardo DiCaprio made up the star-studded trio stepping out on day 8 of Cannes for the premiere of Quentin Tarantino's "Once Upon a Time in Hollywood."

Pitt and DiCaprio were a sight for sore eyes in complementing black tuxes, looking more dapper than ever -- while Robbie had an unexpected couture moment.

The 28-year-old actress ditched the dress for a Chanel archive look, wearing a sequined tunic and sequined black pants from Spring 2011 for her Cannes debut. Opting out of this year's Met Gala and Oscars, this is Robbies' first major red carpet moment this spring.

Elle Fanning is the one to beat during 2019 Cannes Film Festival in terms of her next-level looks. The actress had fun with fashion, paying homage to the 20th century with an oversized custom Christian Dior Couture pussybow blouse, Agent Provocateur Mercy Corset, complete with a structured woven hat. Her best look yet? We think so.

Dakota Fanning, Sara Sampaio, Winnie Harlow and DiCaprio's model girlfriend, Camila Morrone, also made red carpet rounds. Check them out in the gallery above!