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Watch: Hayley Williams and Taylor Swift perform 'Castles Crumbling' live.

Watch: Hayley Williams and Taylor Swift perform 'Castles Crumbling' live.

It finally happened! Paramore's Hayley Williams joined Taylor Swift onstage tonight in London to perform 'Castles Crumbling' together live during the surprise section of the Eras Tour set.

Watch clips of the performance below...

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COUP DE MAIN’S TRUE JAMS PLAYLIST

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