We're so jealous right now!
This weekend, during her Enigma show in Las Vegas, Lady Gaga had one very special surprise planned for her audience.
Just before her closing song, Gaga invited her 'A Star Is Born' co-star, Bradley Cooper on stage for a live performance of 'Shallow'.
What makes the moment so much more amazing is the fact you can tell how nervous Bradley is, which is fair considering it's his first time singing infront of an audience.
Watch the full vid below: