Bradley Cooper and Lady Gaga surprise the public in Las Vegas with a shallow duet

Lady Gaga and Bradley Cooper played "Shallow" for the first time Saturday night.

During Gaga Enigma live concert in Las Vegas, the singer invited her A star is born co-star and director on stage with her. Cooper, who was sitting in the audience, was encouraged by the crowd as he joined Gaga to play his duet.

After sharing a hug, Gaga announced to Cooper: "I've even got in ears."

"Jackson never used them," said Cooper, referring to his Jackson Maine character, as he was preparing to occur.

A video clip shows that Gaga helps Cooper get ready to sing, giving him a kiss on the cheek before sitting down.

As Cooper sang, Gaga kneeled next to him and put his arms on his leg.

After Cooper finished his solo, Gaga got up and started his part of the piano song. In the video posted on Instagram by @JoeyMonroe, you can see Cooper and Gaga looking at each other warmly as they continue the song. Towards the end of the song, Cooper sat next to Gaga and put his arm around his waist.

In just a few hours, the tandem may step on the red carpet at the SAG 2019 Award, or A star is born is nominated for several awards.

Watch the video above to see Gaga and Cooper sing "Shallow" in Las Vegas!