The two locked eyes during the performance of Cooper's verse, with Gaga eventually looking at the crowd with a smile as if to say: "Can you believe he just did that?"
Fans attending Lady Gaga's Enigma show in Las Vegas were delighted to see the performers reunited.
Gaga then proceeded to sit at the piano to play the keys.
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Gaga joked that she got Bradley in-ear headphones, and he responded that "Jackson never used these!"
After their nominations for Best Actor and Actress respectively, you would think Bradley Cooper and Lady Gaga were done singing their hearts for people. "He made that movie A Star Is Born". Then, after he finished his solo, video shows her get up and begin her part of the duet on the piano. The song is the highlight of the show for many attendees and the crowd sings along whenever it is performed.
The track has already won awards from the Critics' Choice Awards and the Golden Globes.
The pop icon was joined onstage by her A Star is Born director and co-star Bradley Cooper for a performance of their Oscar-nominated hit Shallow.