On the final day of Radio 1's Big Weekend fans were treated to an hour-long Foo Fighters set as they closed the event at Earlham Park in Norwich.
Frontman Dave Grohl dedicated Congregation from their latest album to Taylor Swift, which they wrote in her hometown of Nashville.
He told the crowd: "I'm officially obsessed, she might want to get a restraining order.
"To my opening band, Taylor Swift. Taylor and the Swifts."
He also told fans that "my kids will kill me for saying this, but this one is dedicated to Taylor Swift" as he closed Big Weekend with Best of You.
Despite a day of showers, the 25,000 fans who attended the event were still in high spirits.
Taylor Swift played on the main stage for 45 minutes before Foo Fighters with her set mainly culled from her latest album 1989.
The sun was out when Taylor Swift told fans: "I have never done a Radio 1 Big Weekend before until right now. And I've never played in Norwich before now."
Before playing Shake It Off, which got to number two in the Official Single Chart, the 25-year-old singer paid tribute to Radio 1 and the crowd.
"I want to say the biggest thank you to Radio 1 for putting me in front of this crowd tonight. You guys are a dream, singing along and dancing.
"Tomorrow we all have to go back to normal life. I just want you to think about the fact that you are at a festival with so many thousands of other people who love music and are all facing forward.
"No-one's looking at you, no-one's judging you. So I hope for the next three and half minutes you fully, epically, Shake It Off."
By Chi Chi Izundu - Newsbeat entertainment reporter at Earlham Park, Norwich
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