(CMT Offstage keeps a 24/7 watch on everything that's happening with country music artists behind the scenes and out of the spotlight.)

It's a three-hour drive from Nashville to Knoxville, Tenn., but Carrie Underwood must have been up for a little trip. Or, as she said, she was just "in a sneaky mood" on Friday (March 2). So off she went, to sneak up on Brad Paisley in the middle of his show at Thompson-Boling Arena on the University of Tennessee campus. Normally, when it comes time in his set to do "Remind Me," he has a hologram of Underwood to sing with him. Knoxville had the real thing, though. Underwood slipped into the arena and finally shocked Paisley for a change. "Had so much fun tonight surprising @BradPaisley -- Thanks Knoxville!!" she tweeted after the show. And Paisley, who is known for pulling pranks on his own tourmates, had nothing but good things to say about being on the receiving end of a surprise. "Coolest thing that's happened this tour!," he said when he retweeted Underwood's tweet. I'm crossing my fingers she is up for another surprise on June 9, when Paisley plays Chicago's Wrigley Field.