The 28-year-old singer treated the crowd at London's Wembley Stadium on Friday to a surprise appearance by Niall Horan, who came out to perform his hit, "Slow Hands" with her. Friday's concert is the first of two dates Swift has in London as part of her Reputation tour.
"Soundcheck at Wembley Stadium with this guy @niallhoran THANK YOU for surprising the crowd tonight!!! ? @GarethCattermole @hogieaaa @GettyEntertainment," Swift captioned a slideshow of images of herself and Horan having fun during rehearsals on Instagram.
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Here's the Song Harry Styles Wrote About Taylor Swift, 'Two Ghosts'
"I mean, I don't know if they're about me or not…but the issue is, she's so good, they're bloody everywhere," Styles said in a 2017 interview with Rolling Stone. I write from my experiences; everyone does that. I'm lucky if everything [we went through together] helped create those songs. That's what hits your heart."
"In writing songs about stuff like that, I like tipping a hat to the time together. You're celebrating the fact it was powerful and made you feel something, rather than 'this didn't work out, and that's bad,'" he added. "And if you run into that person, maybe it's awkward, maybe you have to get drunk...but you shared something. Meeting someone new, sharing those experiences, it's the best s**t ever. So thank you."
Swift is now dating British actor and model Joe Alwyn. See more in the video below.