Lady Gaga brought Bradley Cooper out on-stage for a surprise performance of "Shallow" in Las Vegas.
Gaga, 32, who played a young singer in A Star Is Born, is now in the midst of a residency at the MGM Park Theater, where she started her run of shows in December.
Bradley Cooper directs and stars in A Star Is Born alongside Lady Gaga. After Cooper joined her on stage he joked that he couldn't "hear anything" and has "never used" in-ears before. "Yo Bradley, you wanna come up and do this one?"
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In video clips shared on social media from concert-goers, Gaga sits at the piano while Cooper is on a stool as they sing the Oscar-nominated track together.
Cooper rocked out behind her, playing an air guitar as Gaga sang the emotional ballad.
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 past year.
The song earned the singer, born Stefani Germanotta, an Academy Award nomination and a Golden Globe Award for best original song.