Gwen Stefani and Blake Shelton are continuing to make sweet music together. The couple announced their latest duet, a song titled "Purple Irises," via a joint Instagram post on Feb. 5.

Still, the Nashville event always comes with surprises, and Blake Shelton brought one of the biggest unexpected moments of the weekend.

Country star Blake Shelton had the time of his life performing with this surprise CMA Fest guest on Saturday, June 7.

As if the occasional musical duet wasn't exciting enough, Stefani and Shelton are officially teaming up for a brand-new ...

Still, the Nashville event always comes with surprises, and Blake Shelton brought one of the biggest unexpected moments of the weekend.