During May's tornado relief concert held in Durant, Okla., Blake Shelton gave fans in attendance a special surprise when pop superstar, Kelly Clarkson, joined him onstage for a rare duet of the recent chart-topping Jason Aldean/Kelly Clarkson hit 'Don't You Wanna Stay.'

A fan at the concert, which also featured Reba McEntire on the bill for both nights, captured the duet in a new video which surfaced on YouTube (seen below) earlier this week. Shelton holds his own against the singing powerhouse who originally recorded the tune with country-rocker Aldean for his latest album, 'My Kinda Party.' Shelton appears to be thrilled in the clip from the concert as he listens to Clarkson belting out the lyrics in pure amazement.

Aldean and Clarkson took the song to the top of the country singles chart for an impressive three solid weeks in March, and have performed the tune on several televised programs over the course of its time-span on the charts.

The relief concert took place May 25 and 26 nearby where Shelton resides in southern Oklahoma. The two superstars helped raise $500,000 for victims of the tornadoes that ravaged Atoka County, Okla.

Watch Blake Shelton and Kelly Clarkson Perform 'Don't You Wanna Stay' Live