Matty Healy welcomed Taylor Swift as special guest at the 1975 show.

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She hit the stage via perform "Anti-Hero" live for the first time.

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In a video, Swift could be seeing playing a white guitar.

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She was wearing a sparkly mirror dress during the performance.

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The performance of “Anti-Hero” comes as the single reached No. 1 on the Billboard.

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At the O2 Arena, Swift also performed The 1975’s “The City” on her own.

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The 1975 guest appearance is Swift’s first stage appearance since in september.

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The performance comes before Swift is set to go on her Eras Tour.

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The tour was started on March 17 in Glendale, Arizone.

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Healy also performed with emo rockers Dashboard during the show.

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