VIDEO : Blake Shelton is So Into Gwen Stefani

Blake Shelton and Gwen Stefani on "The Voice." The country crooner played the modesty card when discussing girlfriend Gwen Stefani, saying he's surprised she actually went along with dating him. "I still can't believe it. "Maybe she needs help." Questions about the health of Stefani's senses aside, Shelton said they've been studying up on each other's extensive back catalog of music as their relationship develops -- and some of her hits have turned out to be very familiar to Shelton.