Brad Pitt and Leonardo DiCaprio are the best of buds.

The two starred together in 2019's "Once Upon a Time in Hollywood" -- their first movie together -- and they clearly enjoyed working with one another.

At the Screen Actors Guild Awards on Sunday, Pitt, 56, spoke with Entertainment Weekly about the camaraderie between himself and his 45-year-old co-star, as well as the nickname DiCaprio gave him.

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"'Lover,' he calls me 'lover,'" Pitt revealed with a shrug. "It's a bit confusing, but I roll with it."

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Aside from having nicknames -- Pitt shouted out "LDC" in reference to DiCaprio at the Golden Globes following his award win -- Pitt said the bond between himself and DiCaprio was "easy."

This image released by Sony Pictures shows Leonardo DiCaprio, left, and Brad Pitt in a scene from "Once Upon a Time in Hollywood." On Monday, Jan. 13, the film was nominated for an Oscar for best picture.

This image released by Sony Pictures shows Leonardo DiCaprio, left, and Brad Pitt in a scene from "Once Upon a Time in Hollywood." On Monday, Jan. 13, the film was nominated for an Oscar for best picture. (Andrew Cooper/Sony via AP)

“You’ll find, with most of the guys, I would say we’re all pretty much rooting for each other, we all have respect for each other, we all have a good laugh with each other," noted Pitt. "And it plays. And it’s pretty easy.”

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Pitt won the award for his supporting performance in "Once Upon a Time," and DiCaprio was nominated for his. Both have also been nominated for Oscars for the same roles.