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Before inviting him on stage Gaga told the audience, \"You may have heard of that movie, 'A Star is Born.' ... Hey Bradley, wanna come up and do this one with me?\"

Cooper, who also directed the film, sang along with Gaga and even rocked out with a little air guitar during the performance. Unsurprisingly, the footage hit social media seconds after the performance.

Bradley Cooper joining @ladygaga on stage at #enigma in Las Vegas!! pic.twitter.com/of6oi9TESd

— Nancy Pisa (@nancypisa) January 27, 2019

Cooper was snubbed in the Best Director category after being nominated in the Golden Globes. He wouldn't actually win an award for the song \"Shallow\" though, which was written by Lady Gaga, Mark Ronson, Anthony Rossomando and Andrew Wyatt.

But each has a chance to leave with a gold statue. Gaga is nominated for an Oscar in Best Actress in a Leading Role, while Cooper is up for Actor in a Leading Role.

#BradleyCooper surprise at @ladygaga concert in Las Vegas. @ParkTheatre pic.twitter.com/XMo13wOfC5

— RichardAyoub (@RichardAyoub) January 27, 2019

Lady Gaga signed on for a residency at the Park Theater at MGM last year. She will perform 20 shows in 2019, with Saturday's show being her fourth. She has just one show in February, leaving plenty of time for her to get ready for the Oscars on Feb. 24.

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