Los Angeles: Singer Blake Shelton is said to be self-conscious and really sensitive about his weight. According to a source, Shelton, who is dating Gwen Stefani, refuses to go shirtless in front of anyone. “He is so sensitive about his weight. You will never see him shirtless. Backstage, he always keeps his dressing room closed,” the source told pagesix.com. “At photo shoots, he will not change on set. He goes back to his dressing room whenever he needs to take his clothes off. He is not in bad shape. He's just so shy about showing off his body,” the source added.