During Lady Gaga's Engima residency at the Park MGM in Las Vegas, her Saturday show was met with great surprise as she brought out a "friend" of hers, Bradley Cooper. The two performed their Golden Globe-winning original song, 'Shallow' from their movie A Star Is Born, which Cooper also directed.
Before the performance, Lady Gaga says to the crowd, "So a really good friend of mine… I don’t know if you know him but his name is Bradley. He made that movie A Star Is Born." She went on to address Bradley Cooper, who was sitting in a private section, saying, "Yo Bradley, you wanna come up and do this one?" Needless to say it was a spectacular performance.