Longtime journalist Katie Couric jammed with Jimmy on Tuesday as a guest backup singer during the concert.

"I thought this would be a fun, very visual kind of little fling for me and it happened to be in Indianapolis, so here I am again,” Couric said.

"She can sing. So, it could be a career starting move for her. I don't think it's going to be a career-ending move for me,” Buffet said.

More of Couric’s performance can be seen on her new talk show, “Katie,” which will air Sept. 10 on RTV6.