Taylor Swift Performs a Surprise Mashup With Haim in London: Would You Join Us in Singing?

Taylor Swift joined Este, Danielle and Alana Haim to sing a mashup of the foursome's remixed track "Gasoline" and her own song "Love Story"

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When Haim and Taylor Swift reunited on stage for a special mashup on Thursday night, they delivered fans an amazing surprise

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The trio of sisters hauled up their buddy to surprise fans when they performed at the O2 Arena in London as part of their One More Haim Tour

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"All Too Well" singer, 32, joined Este, Danielle and Alana Haim to sing a mashup of the foursome's remixed track "Gasoline" and Swift's "Love Story."

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"When I learned that my daughters were performing at the O2 in London, I was excited

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'I'm gonna have to see that.' And it looks like there's about 20,000 other people that also thought that," Swift said as she took the stage

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We had a thought, that if we were to do some sort of mashup, we could possibly maybe get you to sing the loudest that you have sung all night

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