I've always thought BLAKE SHELTON'S nonstop Tweets about being sloppy drunk all the time were nonsense.  Well, JANA KRAMER is opening on his summer tour . . . along with EASTON CORBIN . . . and she's a believer. She told CMT.com, quote, "Honestly, I'm going to have to prepare my liver for that tour. But it's going to be really fun.  He's a great guy.  He's really fun to be around as well.  It's just going to be a good time."