Ed Sheeran joins Bruno Mars on stage for surprise duet of 'Thinking Out Loud' - and it is AMAZING!

Bruno Mars fans in Nashville were treated to an extra special performance when none other than Ed Sheeran made a surprise appearance on stage.

Performing a spine-tingling live version of the 27-year-old's hit song 'Thinking Out Loud', the two singers wowed the crowd, who sang along passionately, before Bruno broke out into a killer guitar solo.

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Ed's appearance at the show wasn't completely out of the blue, though.

Prior to the concert, Bruno had shared a video on social media of Ed singing him "Happy Birthday" backstage.