Blake Shelton is all about mixing business with pleasure. The country superstar, whose new album, “For Recreational Use Only,” comes out May 9, says he can’t get enough of collaborating with wife Gwen Stefani.

Blake Shelton has plenty of things he can do on his own — host award shows, dominate country music, and run his Oklahoma ranch. But one thing he doesn't want to do solo? Make an album without a feature from his wife,

Sometimes things can get dicey between couples when it comes to working together, but the sentiment doesn’t apply to Blake Shelton and Gwen Stefani. Shelto