While the 39-year-old said that his romance with the pop star is "a lot of fun," he admitted the thought of the duo together is an "odd idea."
Speaking on the public fascination over his new relationship, the singer dished:
"It's a little weird. We could not be, on paper, any more different. I mean, I'm a country singer and she's a ska, rock, pop, whatever it is…and it's just an odd idea. But man, it's a lot of fun. I've gotta be honest about that."
As for Blake and Gwen's steamy duet Go Ahead and Break My Heart, which they recently performed on The Voice, Shelton said the reaction has been "crazy," explaining:
"I actually wrote that song, started it just to try to impress her, to be honest with you. And I sent it to her just half done…and she wrote the next verse and sent it back to me. And so it was like, oh, we've got a song together. That's kind of cool."
We're loving the honesty!
Ch-ch-check out the rest of Blake's interview (below) and get ready for his album If I'm Honest — dropping this Friday!