Blake Shelton teamed up with his fellow ' The Voice ' coach Christina Aguilera for a live duet on her song 'Just a Fool' on tonight's performance (Nov. 19) episode of 'the show.

And I'm sure critics would call me naive for investing at a time like this. But I don't consider myself naive. To the contrary, if I'm being 100% transparent, I'm worried about the U.S. economy.

Kept my big mouth shut 'Cause now everything is just wrong, {wrong, wrong} {I'm just a fool} A fool for you I'm just a {fool, oh oh-oh oh-oh oh} [Christina Aguilera (Blake Shelton):] (I, I had my ...