Cannes 2019: Leo DiCaprio and girlfriend Camila Morrone walk red carpet separately

Leonardo DiCaprio and his girlfriend, Camila Morrone, hit the red carpet for the premiere of his latest film at the Cannes Film Festival on Tuesday -- but they opted to do so separately.

The couple, who has been dating for a little over a year, both stepped out for Quentin Tarantino's highly-anticipated "Once Upon a Time in Hollywood" premiere, where co-stars Brad Pitt and Margot Robbie were also on-hand to celebrate the movie's first ever showing.

SEE ALSO: Inside Leonardo DiCaprio's 'very serious' relationship with Camila Morrone

Morrone, 21, was absolutely stunning in an off-white strapless gown with a feathered hemline. She finished off the chic look with a sleek updo and an eye-catching diamond statement necklace.

See photos of Camila Morrone at the 2019 Cannes Film Festival:

Meanwhile, DiCaprio, 44, opted for a classic tuxedo as he posed alongside his co-star, Pitt.

Morrone and DiCaprio's separate red carpet appearance on Tuesday comes a few days after photos went viral of the former "Titanic" actor taking photos of Morrone on the beach in Cannes.

SEE ALSO: Leonardo DiCaprio, Margot Robbie and Brad Pitt attend 'Once Upon a Time in Hollywood' premiere

Last November, sources described the couple as "very serious" and claimed that they have already "talked about getting engaged." Insiders say that the notorious bachelor, who has never been engaged, is finally ready to settle down after years of dating a long list of much younger women.

"Everyone is saying that marriage could be soon for them," a source told Us Weekly, adding that the Oscar winner is "ready to have kids."

See more photos from the "Once Upon a Time in Hollywood" premiere: