November 15, 2017 06:45 PM

Every time Blake Shelton hears that Gwen Stefani song, he can’t help but groove.

The 2017 Sexiest Man Alive sat down with PEOPLE to answer a few burning questions from some young fans when he revealed his favorite tune written by Stefani, his girlfriend of two years.

“My favorite Gwen Stefani song – I like a lot of her songs and I really like her last album – but I think I gotta go with ‘Underneath It All,'” he says. “I love that song. I think it’s such a cool record.”

Watch PEOPLE Cover Story: Sexiest Man Alive — Blake Shelton, available now, on PeopleTV. Go to PeopleTV.com, or download the PeopleTV app on your favorite mobile or connected TV device.

For more coverage, follow our country magazine on Flipboard.

For more of Shelton’s revealing interview — including his life with Stefani — pick up the latest issue of PEOPLE, on newsstands Friday.

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