Taylor Swift was joined by Niall Horan on stage as she played her first ever concert at London's Wembley Stadium.
Swift surprised her thousands of fans at the packed-out arena as she welcomed the One Direction star for a duet of his solo hit Slow Hands on Friday night.
The US pop star, who will also play at the venue on Saturday before taking her Reputation Tour back to the United States next week, shared her excitement at performing for the first time at
the world-famous location.
"I can't pretend like this isn't my first time playing a show headlining Wembley Stadium, because it is," she told the crowd.
"And knowing what you could be doing in London on a Friday night - I spend a lot of time in London so I know there is a lot you could be doing in London on a Friday night - and yet, you've decided to spend your night with us on the Reputation stadium tour."
Swift, who played two shows in Croke Park last weekend, opened the show - filled with state-of-the-art displays, pyrotechnics, several costume changes and the addition of large snakes slithering up into the air from the stage - with her song ...Ready For It?
Swift, 28, performed her classic hits Bad Blood, I Knew You Were Trouble, We Are Never Ever Getting Back Together and Love Story, among others.
Swift also explained her recent hiatus, telling fans she wanted to take a step back from the limelight.
"I took a few years off before I made Reputation," she said.
"I wanted to figure out what my life would be like if I wasn't in the spotlight, but I missed you guys so much.
"I did a lot of thinking about my reputation and its concept, what does it mean? Can it really affect your happiness if your reputation doesn't match who you are?"
Swift's Reputation Tour has packed stadiums in the United States, and she has now brought the hotly anticipated show across the Atlantic.