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.

Dave Grohl, Tom Waits, Keith Urban, Gwen Stefani as well as Katy Perry have all had a turn sharing the spotlight with the band.

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