▲The actor surprised thousands of Little Monsters when he came out during one of her shows in Las Vegas to perform 'Shallow' in January 2019. Gaga knelt by him as he started singing, and it was too cute to handle.

▲Cooper told Conan O'Brien that the two first bonded at Gaga's home, where she heated him up some leftover pasta and he sang in front of someone for the first time.

▲After gushing about him during her acceptance speech for Best Original Song at the Golden Globes, Gaga took to social media to gush some more, adding “Thank you B,” and only cementing rumors about that tattoo.

▲It did not go unnoticed.

▲The two shared a hug at their Toronto premiere, and Gaga told the audience, “This has completely changed my life, this movie ... To say that Bradley is a consummate professional and incredible filmmaker would be an understatement."

▲The pop singer's real name is Stefani Joanne Angelina Germanotta, and during her speech at the American Cinematheque Awards she said that Cooper called her by her real name and made her “deep dive into a place where [she] had to see her again.”

▲Is there anything cuter? Could Gaga be smaller?

▲For their first major red carpet together at the Cannes Film Festival in May 2018, Gaga fixed Cooper's tie and brushed some rain off his jacket mid-red-carpet.

▲The first-time director and first-time actor have one another intertwined in one of the greatest accomplishments of their lives, so it's no wonder they love being around each other.

▲Gaga explained when they starting making the film "we kind of shook hands literally and he said, 'You are an actress.' I said to him, 'You are a musician.'"

▲Cooper requested that Gaga come to the screen-test without any makeup, and when she arrived he looked at her face, grabbed a makeup wipe, and removed the sneaky layer of concealer. Gaga credits Cooper with film's embrace (and her own adjustment to) vulnerability.

▲The hostess poked fun at Gaga's line, and when the camera turned to the singer she yelled, "It's TRUE!"

▲Gaga recently revealed a new tattoo of a musical staff with the notes spelling out G A G A—if it's in the treble clef. There is no clef, however, and in the bass clef the notes spell B C B C. Okay, so her manager Bobby Campbell got the same tattoo, but there's a second person with those initials too...

▲"I was like, 'Have I known you my whole life?' It was an instant connection, instant understanding of one another," the world-famous pop star told Vogue in 2018.

▲"I felt privileged every single day that I was on set to watch him work with ninja-like precision, with such a vision, such a passion and then also a liberation,” she added.

▲The two never look bored in each other's company.

▲Even while in the middle of taking a photo with Steven Spielberg.

▲Gaga only has eyes for Cooper.

▲Even though they're not dating, you should find yourself someone who looks at you like Cooper looks at Gaga.

▲At TIFF, the musician wore a black velvet Armani Privé gown with a gauzy veil, and perhaps to fuel the hopes of their coupling up, Cooper lifted her veil on the red carpet.

▲He wasn't there, but when accepting Best Pop Duo / Group Performance for 'Shallow,' she gave a heartfelt thank you and said, “Bradley, I loved singing this song with you.”

▲Back in April 2016, two years before 'A Star Is Born' premiered, Gaga was photographed riding on Cooper's Ducati, and the pair were seen just hanging around, looking cool.

▲They talk about each other endlessly in interviews, sharing nothing but love and respect for one another. And then there's Gaga's iconic quote about how there can be 100 people in a room and 99 who don't believe in her…

▲The pair attended the Hollywood Walk of Fame induction ceremony of their costar Sam Elliott, and seemed to be having more fun than anyone else.

▲The duo looked fabulous on the Venice Film Festival red carpet, but fans, and Cooper, were floored by Lady Gaga's feathered light pink gown.

▲Cue the adorable hand gesture.

▲Gaga and Cooper constantly do this move in front of cameras where they gesture at each other, and no, we're not sick of it yet.

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"I don't know that I've ever had a closer artistic relationship than I have had with Bradley, a closer exchange," Gaga told Vanity Fair.

▲Despite their on-screen smooches, the first time Gaga kissed the actor on a red carpet was at the film's UK premiere in September 2018. Gaga gave her costar/director a huge smooch as Cooper looked dreamily at the cameras.

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In an interview with The Hollywood Reporter, Cooper clarified that they weren't just performing the song 'Shallow' at the Oscars. They were also acting out the scene from the movie, where their two characters are falling in love on stage. "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."

▲Performing their wildly popular song 'Shallow' at the 91st Academy Awards, the two locked eyes and sang right to each other, as if the room was empty.

▲Near the end of the song, Cooper joined Gaga on the seat and they gazed lovingly at each other's faces in very close proximity, as the Oscars cameras zoomed in ready for a smooch. Cue the applause!

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Gaga revealed on Entertainment Weekly's 'Awardist' podcast that she "absolutely" sought advice from Cooper before taking on her role as Patrizia Reggiani in 'House of Gucci.' "Bradley Cooper believed in me for the role of Ally Maine in A Star Is Born. It was the success of our artistic collaboration that landed me where I am now," she said. "I've confided in Bradley for years and I've always appreciated his support and his advice, his thoughts on my future endeavors."

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The bond that costars Lady Gaga and Bradley Cooper shared in 'A Star Is Born' had the world completely enamored. The internet exploded with hopes that the on-screen chemistry would carry off-screen, despite the fact that Cooper was happily partnered up with supermodel Irina Shayk at the time. Gaga and Cooper clearly shared something special that was especially obvious to everyone who saw their Oscars performance.

And their chemistry isn't fading, as the former co-stars and off-screen friends had a sweet reunion at the 2022 SAG Awards, where Gaga was nominated for her role in 'House of Gucci' and Cooper was nominated for his supporting role in 'Licorice Pizza.' The talented duo were photographed embracing and sharing some sweet words, which likely included a "thank-you" from Gaga since she previously revealed she had asked Cooper's advice on whether she should take on the role of Patrizia Reggiani.

The pair have both praised each other publicly to various outlets, though things have been strictly non-romantic. In fact, both stars have dispelled rumors that their on-screen romance was continued off-screen. Regardless, they clearly have a beautiful friendship, so check out their greatest moments together.