The artist, 37, was seen walking the carpet after all the stars had passed through with Cooper, 48, and his costar Carey Mulligan before the screening of the Academy Museum of Motion Pictures on Tuesday.
Cooper’s daughter, Lea De Seine, 6, also posed with the stars.
The two worked on the film A Star is Born back in 2018, which starred Cooper as a hard-drinking musician who discovers and falls in love with a young singer, played by Gaga.
The film ended up going on to earn eight Oscar nominations, including Best Actor for Cooper and Best Actress for Gaga.
The Grammy winning artist took the film’s only Oscar home for Best Original Song “Shallow.” The song went on to earn three Grammys as well.
In November 2021, Cooper told The Hollywood Reporter that they had simply chosen to stay in character to curb his nerves while singing live at the awards show.
“Just from a personal standpoint, it reduces the anxiety level,” Cooper said. “They kind of fall in love in that scene in the film. It’s that explosive moment that happens to happen to them on a stage in front of thousands of people… It would have been so weird if we were both on stools facing the audience.”
At the time of A Star Is Born’s Los Angeles premiere, Cooper told PEOPLE, “I made a friend for life.”
“As great as this movie was, the thing that I think I’ll take away forever is the relationship I have with her because she is an incredible person. I’m very lucky to have worked with her,” the director said in 2018.
The singer said the same about her costar and director in an Entertainment Weekly interview. “It just has changed me,” Gaga said of her role in the film. “Watching Bradley work was phenomenal and then having him believe in me — it gave me more ammunition to believe in myself and I just feel so blessed to have had that experience.”