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9 February 2014, 00:15
The British star gives a rare live outing of the track recorded for the soundtrack to The Hobbit: The Desolation Of Smaug.
Ed Sheeran came out on stage during Taylor Swift's 'Red' tour in Berlin to perform 'I See Fire' on Friday night (7th February).
The track was recorded last year as the soundtrack to the movie The Hobbit: The Desolation Of Smaug.
Speaking on Twitter following the show, Ed revealed the performance was a gift to his German fans who have kept the song in the top of the charts for two months.
The pair share vocal duties with Taylor getting the audience to raise whatever they could to make the O2 light up.
Ed also came out during Taylor's opening night of the 'Red' UK tour last weekend and was also joined by Sam Smith and The Script's Danny O'Donoghue.
She returns for two final shows this week.