Season 17 ofThe Voice debuts on Monday without longtime coach Adam Levine, and his good friend and fellow coach Blake Shelton is a little nervous about that. "I gotta say that it worries me not having Adam there. It's because he's just been there from the beginning and it would freak me out if Carson left, you know? We were the three that have been there all along and it's just odd, to be honest with you. The one thing that makes it better and okay is that they brought Gwen in, you know, and it's not just because Gwen and I's relationship. It's because she's a veteran of that show also and she's familiar with it and gets it, and that made me feel better, you know, because there's no way around it -- it sucks not having Adam there. He's a major part of that show and my favorite person to kick in the nuts, you know?"