Bradley Cooper Makes Surprise Appearance at Lady Gaga’s Vegas Show

The pair sang their song "Shallow" from 'A Star is Born' during the singer's Saturday night show.

Lady Gaga on Saturday night had a special surprise for the audience of her Las Vegas show, as she brought her A Star Is Born co-star Bradley Cooper onstage to sing "Shallow."

Gaga, who received an Oscar nomination for her role in the film directed by Cooper, has performed the song from Star Is Born as the closing number of her Enigma show, a residency that kicked off in late December.

After Cooper joined Gaga onstage, the singer quipped: "I even got you in-ears!" Cooper also joked that he couldn't "hear anything" and said that "Jackson never used" in-ears, referring to his Star Is Born character.

"Hello, Vegas," Cooper announced before he started singing. Throughout the performance, Gaga played the piano while Cooper sat alongside her.

Cooper and Gaga's duet "Shallow" received an Oscar nomination for best original song.

Watch the surprise performance, below.