We knew there was a rocker chick in there somewhere.
Country music star Carrie Underwood proved just that on Saturday night when she joined The Rolling Stones for a rousing rendition of "It's Only Rock 'N Roll (but I Like It)" at Toronto's Air Canada Centre.
"I just sang with the @RollingStones! Holy cow! I walked off stage and said, 'What just happened?!' Still can't believe it!" the 30-year-old tweeted after joining Mick Jagger, Keith Richards, Ronnie Wood and Charlie Watts on stage.
Underwood is just the latest artist to make a guest appearance during the Stones' 50 & Counting North American tour.