They say you can take the boy out of the country, but you can't take the country out of the boy. So now that Blake Shelton has to spend the better part of the year in Los Angeles filming The Voice ... has it changed him? Christina Aguilera may offer some clues as she previews their duet "Just A Fool" and reveals the interesting new recording technique Shelton developed by using a clothespin. Clearly something he picked up on Hollywood Boulevard. Watch Aguilera explain and listen to the song here.