The audience in attendance at Lady Gaga’s Las Vegas show on Saturday night were treated to an extra special performance from A Star is Born.

Since beginning her residency in Vegas, Lady Gaga has been closing out her show, Enigma, with A Star is Born‘s title track, “Shallow.” However, where it was a duet in the movie, Gaga had instead been performing it solo.

Until now.

Gaga’s co-star, Bradley Cooper, made a surprise appearance at the show on Saturday night, to the delight of everyone in the audience.

“I even got you in-ears,” Gaga quipped, as she and Cooper took their places on stage. “Jackson never used these,” Cooper shot back, referencing his character from the movie. The two joked around a little more before launching into the song.

“Shallow” recently received an Academy Award nomination for best original song, while Gaga was nominated in the Best Actress category for her role as Ally in A Star is Born.