Taylor Swift & Niall Horan Sing 'Slow Hands' Together During London Reputation Tour Stop

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Taylor Swift performs on stage during the Taylor Swift reputation Stadium Tour at Etihad Stadium on June 8, 2018 in Manchester, England. 

The U.K. loves Niall Horan, so look what you made her do. 

Fans attending Taylor Swift's Reputation Tour might have expected a surprise guest, but none of them were emotionally prepared for a Niall Horan-level surprise. The former One Direction member, born and raised in Ireland, walked out onstage to join Swift and performed his hit song "Slow Hands" in front of a packed house at London's Wembley Stadium. 

The Reputation Tour, which kicked off May 8 in Arizona, has featured a handful of A-list surprise guests on select dates, including Troye Sivan, Selena Gomez and Shawn Mendes

Swifties, of course, lost their minds, as seen in some of the tweets and concert footage below.