Carson Daly announced the news on The Voice Tuesday night.
Carson held up the People issue on the show and asked Adam how he felt about it. Adam said "Fantastic," but then he stopped and said "Sexy!" Blake Shelton then told Adam he thinks he's sexy because of "what's on the inside."
Adam spoke to People and said, "As a musician, you have fantasies that you want to win Grammys, but I didn't really think that this was on the table. I was just amazed and stunned and it almost seemed like they were kidding, but they weren't, so that's cool."