Taylor Swift: 'I Want Crazy' with Hunter Hayes - Watch Now!

Taylor Swift takes the stage with Hunter Hayes during her final performance of the Red tour held at the Bridgestone Arena on Saturday night (September 21) in Nashville, Tenn.

The 23-year-old musician invited her pal on stage to perform his hit song “I Want Crazy” for a sold out crowd of more than 14,000 fans.

PHOTOS: Check out the latest pics of Taylor Swift

Also pictured: Ed Sheeran in costume backstage with Taylor after the show.

“Show highlight: @edsheeran dressed like a clown and danced the choreography to We Are Never Ever Getting Back Together. Quite the finale.” Taylor tweeted after the show.

Watch Taylor Swift and Hunter Hayes performance of “I Want Crazy” below: