According to Page Six, witnesses say the pair got cozy at a restaurant near the ArcLight movie theater in Los Angeles, the movie's premiere location, where they spent some time with a group of friends.
Pitt and Miller were "heavily enjoying each other's company," and "were talking to each other all night," a source told the publication.
Another insider added that Pitt, who's been caught looking frail in recent months, was "in very high spirits, which he hasn't been for a long time. He seems to be over a hump."
Miller previously denied dating rumors, saying: "So this is the truth about that: Brad Pitt is producing the movie that I just wrapped, but I didn't see him. He's not been to the set. You know, he's the producer of the film and I've met him twice. It's insane."
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Meanwhile, sources say Jolie has banned her kids from calling their dad in recent weeks.
As for their recent rendezvous, reps for Pitt and Miller did not comment on the matter.
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