The two pop superstars are seen holding hands, getting cozy on a bench and sharing a toast when performing the song on 'The Voice'.
Lady GaGa performed her single "Do What U Want" on "The Voice" on Tuesday night, December 17. The Mother Monster wasn't alone as Christina Aguilera, who's also a coach on the singing competition, joined her onstage to sing the second cut off "ARTPOP" album.
Wearing a shiny outfit and a wig, GaGa sang while dancing with some dancers. Appearing onstage mid-song, Aguilera showed off her figure in a dress with similar color to GaGa's. The two singers sounded and looked perfect together.
At one point, GaGa rested her head on Aguilera's chest. The performance ended with the two pop stars linking arms with glasses of champagne.
GaGa and Aguilera were not the only performers on that night's show. Celine Dion and Ne-Yo hit the stage and delivered the first live performance of their uplifting duet, "Incredible".
Previously, Dion sang her hit single called "Love Can Move Mountains" with Adam Levine's protege Tessane Chin, who later came out as the winner of the fifth season of "The Voice".
Lady GaGa and Christina Aguilera Perform "Do What U Want":
Celine Dion and Ne-Yo Perform "Incredible":