WATCH: Carrie Underwood And John Legend Cover Blake Shelton Hit

Carrie Underwood and John Legend covered Blake Shelton's 20-year-old- hit, "Austin," performing it together on John's online show from NBC's The Voice, "Trailer talk."

John posted a video of the performance and interview with Carrie on his Instagram, writing, "I sat down with @carrieunderwood before we sing our duet 'Hallelujah' tomorrow night on the @NBCTheVoice finale! Be sure to come to see my residency at @PHVegas and Carrie’s at @ResortsWorldLV - tickets on sale now! #TrailerTalk #TheVoice."

Blake responded to the post, writing, "Damn y’all.. @carrieunderwood @johnlegend."

See that post HERE.