Blake Shelton made an appearance on The Tonight Show Starring Jimmy Fallon on April 13 and his girlfriend, Gwen Stefani, joined in on the fun.While Shelton chatted with Fallon about being quarantined on his property in Oklahoma with “a bunch of Stefanis,” Stefani appeared with some tools to shape Shelton’s mullet.“I had to cancel my tour,” Shelton said of the coronavirus pandemic.