Ronnie Dunn joined George Strait on stage during the Cowboy Rides Away Tour at the BOK Center in Tulsa, Okla. on April 19.

The country legends joined forces to perform 'Amarillo By Morning' and 'You Look So Good In Love,' a performance that left the two men with smirks on their faces during the romantic tune.

“All the guys in the crew went, ‘You’re not singing that! Two dudes are not going to get on stage and sing that, man,” Dunn told Taste of Country before the performance.

Despite the band's reservations, the duo delivered a great version of the tune, and their chemistry and friendship was obvious throughout the set. While on stage with Strait, Dunn also showed fans the proper form for taking a selfie, later posting the photo to Twitter.

Strait, who was recently crowned Entertainer of the Year at the 2014 ACM Awards, will be retiring from the road after a star-studded final concert in Arlington, Texas, on June 7.