Chris Willman Music WriterWith Blake Shelton and Gwen Stefani co-headlining the second night of the Bud Light Super Bowl Music Fest in Los Angeles, it was a certainty that the audience would get duet versions of “Nobody But You” and “Happy Anywhere,” the two Shelton-hits-with-Stefani-harmonies that they often perform together even when they’re just in town for each other’s shows. Although those marked the only moments the marrieds appeared on stage together during a long night at Crypto.com Arena, there were also a good amount of references to one another during their respective sets, with the country superstar in particular playing it mock-humble as he compared himself derogatorily to the woman he called “Mrs.