Blake Shelton seems like he's over the moon in his current relationship with Gwen Stefani, but he says he's still not sure exactly what she sees in him.

The country superstar and coach on The Voice stopped by Late Night With Seth Meyers on Thursday (Aug. 4), and sat down for an interview. When Meyers commented on how exciting it is to see the famous pair as a couple, Shelton gushed, "I still can't believe it!"

"I think that she must have some vision problems," Shelton quips in the clip above. "Maybe she needs help, I don't know."

The pair first met on the set of The Voice, where they were both acting as coaches for the aspiring singers. They got together unexpectedly after both of them went through high-profile divorces at the same time, and Shelton admits they weren't entirely familiar with each others' music at the time.

"She really had to start learning [my songs], 'cause she's not in that world," he tells Meyers, adding that he was recently tuning around through satellite radio and came across No Doubt's "It's My Life," realizing that it was her singing for the first time.

"I've always known 'Hey Baby,'" Shelton adds. "I didn't know she sang that freaking song. It's like, 'Wow. That's you? That's you, and we've kissed? Wow, that's amazing!'"

Shelton also performed "She's Got a Way With Words," a song that takes aim at an ex with a number of barbed phrases, which many fans have interpreted as addressing his breakup with Miranda Lambert.

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