The crowd at Las Vegas' Park Theater was treated to a surprise appearance during Saturday night's Lady Gaga show: "A Star Is Born" director and costar Bradley Cooper, who joined the singer for a finale performance of the song "Shallow".
"Jackson never used these", Cooper said of the in-ear mics that Gaga handed him, just one charming moment in an incredibly charming thing, even if a more cynical mind-like me?
The crowd reportedly cheered as Cooper made his way to the stage.
Cooper and Gaga are nominated for seven categories in the 91st Academy Awards, including best actor and best actress for the movie. Then, after he finished his solo, video shows her get up and begin her part of the duet on the piano.
Fans attending Lady Gaga's Enigma show in Las Vegas were delighted to see the performers reunited. He then joined her on the piano bench and wrapped an arm around her to finish out the final chorus together.
The song, which was nominated for an Academy Award earlier this week, is the closing number of the "Enigma" show, the residency that kicked off in December previous year.