Blake Shelton made a surprise appearance at Gwen Stefani's Feb. 19 show in Las Vegas. According to Pop Culture, Gwen said on stage: "I was thinking about just the weirdness of my whole life and career. It doesn't feel like a career, it feels like a life. And then I was looking on iTunes this morning and I'm No. 1 on the country chart, so I just thought that was like, kind of incredible." Shortly after this heartfelt speech, Blake appeared on stage to sing their duet "Nobody But You."