Joe Nichols will likely be one of the millions of people flocking to theaters to see 'The Dark Knight' this weekend. The country crooner has been a big Batman fan since he was a kid. And he's apparently still a kid at heart.

"I had Batman underoos when I was a kid," Nichols announced on stage at Nashville's Ryman Auditorium. "And I had admired my big brother's Superman underoos. It was like, 'One day I'm gonna have Superman underoos. Right now I'm just Batman, but one day...'"

That day finally arrived -- just last November!

"When I turned 31, I got some Superman underoos," he confessed. "I showed my mom. She did not laugh!"