Watch: Haim and Taylor Swift perform 'Gasoline' and 'Love Story' mash-up together in London.

Watch: Haim and Taylor Swift perform 'Gasoline' and 'Love Story' mash-up together in London.

Haim brought out Taylor Swift as a special guest at their sold-out show at London's O2 Arena tonight, performing a mash-up of 'Gasoline' and 'Love Story' onstage together.

Watch fan-filmed videos of the performance below...

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