Why Blake Shelton is gushing about Gwen Stefani...again.

Blake Shelton Opens Up About Romantic Christmas Duet With Gwen Stefani. 

Blake Shelton says he doesn’t deserve a co-writing credit for “You Make It Feel Like Christmas,” his duet with girlfriend Gwen Stefani. "I sent Gwen a couple of lines of the song. She took it and made the song what it is. I just sent her an idea," Shelton tells Entertainment Tonight. "She tries to say that I co-wrote it, but I just sang on it." Shelton goes on to praise his ladylove, saying, "How gorgeous does she look all the time? It's unbelievable.” The couple shared the festive music video for their holiday collaboration last week.