If you were at the Lady Gaga show on Saturday night in Las Vegas, you were in for a real treat. "I even got you in-ears", she told Cooper of the monitors used during live stage performances.
She then took over by taking to the piano while Bradley watched on with a proud smile on his face.
In a video of the duet, Cooper and Gaga look into each other's eyes as she plays the piano, and rests his hand on her arm.
The track has already won awards at the Golden Globes and the Critics' Choice Awards.
The film has been nominated for eight Oscar awards, including Best Picture, Best Adapted Screenplay, and cinematography.
During the interview Gaga talked about Cooper "giving her a chance" saying he was the one person that believed in her. Much to fans delight, the 32-year-old entertainer brought her A Star Is Born director and co-star Bradley Cooper onstage for the finale.