Although Taylor Swift's much-anticipated Eras tour doesn't kick off for another two months (March 17!), the pop queen made a surprise appearance at The 1975's London show last night.

The 1975 resumed their At Their Very Best tour this past weekend in Brighton, and last night played the first of two dates at London's O2 Arena. In the middle of their 26-song setlist, they welcomed Taylor Swift for a two-song acoustic set.

Swift sauntered on stage in a flashy mini-dress, took a sip of a drink, and after being handed her white acoustic guitar, said "I was thinking of doing one that I've never played live before." Then she treated those unsuspecting fans to the first-ever performance of her most recent hit, "Anti-Hero." See some fan footage of that, plus her cover of The 1975's "The City"

See the full setlist below