The 40-year-old musician feels blessed that he is in a relationship with the "Used to Love You" hitmaker, reported Entertainment Tonight.
"I still can't believe it. I think that she must have some vision problems. Maybe she needs help," Shelton joked.
Shelton said he has always been a fan of Stefani's few songs but that time he had no clues that it was sung by the 46-year-old songstress only.
"I've always known 'Hey Baby,' I didn't know she sang that freaking song. I'm like Wow, that's you? That's you and we've kissed?"