Blake Shelton — with her cover of Gwen Stefani's 2006 hit, «The Sweet Escape.»«I'm dying for Gwen to hear this,» Blake raved after the jazzy interpretation of his wife's track. «There's taking a song a making it your own and then there's-- She and Akon are probably gonna have to add you to the copyright.»«That means so much!» Bella said, thanking the country star for his feedback.Her coach, Ariana Grande — who surprised Gwen at the final show of her Las Vegas residency over the weekend — was