Blake Shelton said following Gwen Stefani was the hardest job he's ever had at the WM Phoenix Open Concert in the Coliseum.

Gwen Stefani is singing ... i had nothing to lose/dressed up like a country girl i knew you'd approve/knew i had to kiss you on the Halloween moon... ♡ gx" She even sang the words in a teaser included ...

Blake Shelton fans have gotten used to Gwen Stefani turning up on stage when ... audacious as the "Lonely Goatherd"-interpolating "Wind It Up" and the set-closing "Hollaback Girl," which truly ...