They performed Horan’s track ‘Slow Hands’.
Taylor Swift surprised fans with an appearance from One Direction‘s Niall Horan at her ‘Reputation‘ tour last night (22 June).
It was the first of two London tour dates at Wembley Stadium, the second taking place tonight (23 June). Find stage times here.
The singer has previously brought Selena Gomez, Shawn Mendes and Troye Sivan on stage as surprise guests at the tour.
Watch fans’ clips of her and Niall’s performance below.
After the show, Taylor posted a pic of her and Niall soundchecking, thanking him for surprising the audience.
It’s not known whether he’ll also play tonight.
Tonight, Swift will be joined at the shows by support acts Charli XCX and Camilla Cabello – who have both duetted with the star during previous shows.
The singer paid tribute to the ‘incredible resilience’ of victims of the Manchester bombing, during her first UK ‘Reputation’ tour date, as she played the city’s Etihad Stadium on 8 June.
In May 2017, 22 people were killed and 139 wounded when a suicide bomber detonated a homemade bomb as people were leaving an Ariana Grande concert at Manchester Arena.
Some Swift fans were left furious at the Manchester Etihad Stadium dates after losing their front row seats due to ‘stadium problems’.
Meanwhile, last year, Niall Horan revealed plans to work on album two over the course of 2018.
It follows the release of his debut solo album, ‘Flicker‘ in October 2017.