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Taylor Swift is known for having special guests join her on stage while she's on her 'Red' tour. During her stop at the O2 Arena in London, T-Swift brought out the U.K.'s own Emeli Sande, and they performed Emeli's "Next to Me."

Taylor explained to her fans that they met at the Brit Awards last year before they performed the song for the London crowd.

Check out their duet below!