Taylor Swift stunned fans when she made a surprise appearance onstage at The 1975’s concert in London.
The band are currently on the UK leg of their tour and Shake It Off singer Swift joined them for their gig at the O2 Arena.
Sending the crowd wild as she appeared in a mirrored dress, Swift gave the first live performance of her song Anti-Hero, which is in the running for a BRIT award this year.
Fans flocked to Twitter to express their excitement after getting to see the US star.
One tweeted: “Still not over The 1975 bringing out Taylor Swift last night.
"I literally almost passed out right there in the o2 ahhaha like WHAT.”
“Last night was the honestly best night of my life eternally grateful to @the1975 @taylorswift13,” said somebody else.
Another fan wrote: “Did The 1975 actually bring out Taylor Swift last night or did I make that up because the whole thing feels like a fever dream?
“Running out of the toilets four drinks down and seeing her on the screen when I tell you I RAN for my life omg.”
“Taylor Swift should truly have an O2 residency at this point,” suggested another fan.
“It was such an ethereal experience!!” said another.
“She just casually said to the crowd, ‘So, are you all enjoying your Thursday night?’ whilst everyone was losing their s***.”
Anti-Hero is up for Best International Song of the Year at the BRITs, which take place next month.
It is taking on tracks including Lizzo’s About Damn Time and Beyonce’s Break My Soul.
Swift is also up for the coveted International Artist gong.
Additional reporting from PA.
Watch: Taylor Swift is in rehearsals for The Eras stadium tour