The country superstar had finished his set at the Country Thunder Festival on July 18 when he treated the audience to an encore performance, per Taste of Country. After starting and stopping multiple guitar riffs, and bantering with his bandmates, he began playing the unmistakable opening of No Doubt's "Don't Speak."
That's when Stefani emerged, making her way to Shelton before she began singing the 25-year-old hit. Shelton stepped back, allowing his wife to take center stage and belt out the hit as he accompanied her on guitar.
The performance was captured by a fan who later posted the video online. Check out the surprise performance below.
This isn't the first time Shelton has covered hits from his wife's band. Since the two began dating, he has also performed the hit "Hella Good" in several live performances, albeit with more of a country twang.
Shelton is set to begin his upcoming "Friends and Heroes" tour on August 18.