Taylor Swift Just Sang Ex Calvin Harris' Song ‘This Is What You Came For’—and Swifties Have Theories

glamour.com:

, there was . On June 13, Taylor Swift revived her famous pseudonym at her second Eras Tour performance in Liverpool, England.That's right, during her latest , Swift broke out “This Is What You Came For,” the 2016 hit she wrote with then-boyfriend .

The popular DJ released the song with Rihanna while he was still dating Swift, though she wasn't publicly credited as a writer at the time.Instead, she assumed the name Nils Sjöberg—a move Swift's ex-boyfriend Joe Alwyn would later mimic with the pseudonym William Bowery for multiple Folklore and Evermore tracks.

And while Swift eventually confirmed her identity after her split from Harris, she has only performed the pop banger on two reported occasions: Once at in November 2016 and then at a in February 2017.

Seven years later, she's bringing it back.“Every single time I have an acoustic set, I’m always trying to think of things you might want to hear—maybe things that might be a little bit unexpected,” Swift before breaking into a mashup of “This Is What You Came For” and “Gold Rush,” per . “Let’s see how we did tonight.”Taylor Swift performs in Liverpool, England.Unexpected is definitely the right word. “I DIDN'T THINK SHE WOULD EVER SING THIS," one fan commented on a of the performance, while another wrote “THE BIGGEST SHOCK EVER.” Others predicted the song will might get the “Taylor's Version” treatment on the eventual Reputation re-recording, which Swift has already promised will be “.”“THE LIGHTS ON THE WRISTBANDS ARE GREEN THIS IS SO GONNA BE A VAULT SONG ON REP TV,” one fan noted, while another wrote, "She said 'and that’s mine too.'”Taylor Swift and Calvin Harris dated for 15 months before their split in May 2016, which is when things got messy.