Taylor Swift joins Haim onstage in London for surprise mash-up

Taylor Swift made a surprise appearance at Haim’s sold-out concert in London’s O2 Arena on Thursday (21 July).

The American rock band comprising sisters Alana, Este and Danielle Haim were midway through performing their hit “Gasoline” when they stopped suddenly

Introducing Swift, 32, Alana said: “Wait, you guys. We’re in London, we can’t play London without bringing out a special guest.

“Because not only is this person that I’m about to bring out the most incredible singer, songwriter, producer,

f***** amazing person all around, she’s one of our close friends,” she continued, as Swift walked onstage to thunderous applause and cheers

The “Bad Blood” singer noted she hadn’t “been on stage in a very long time” but that “it’s very nice [to be back]”