Watch Taylor Swift's surprise Ally Coalition benefit performance.

Taylor Swift made a surprise appearance at Jack Antonoff's annual Ally Coalition benefit concert tonight, appearing onstage to perform an acoustic rendition of her song 'Delicate', with none other than Hayley Kiyoko.

Watch fan-filmed footage of the performance below...

Taylor Swift and Hailey performing at the Ally Coalition pic.twitter.com/vk5D2wgkCI
— omarxnyc (@omarxnyc) December 6, 2018

WHEN TAYLOR SWIFT SHOWS UP UNANNOUNCED AND SINGS DELICATE WITH HAYLEY KIYOKO @taylorswift13 @HayleyKiyoko @allycoalition pic.twitter.com/56otMBpBUf
— (@losttheirmind) December 6, 2018

this ain’t for the best
my reputation’s never been worse, so
you must like me for me @HayleyKiyoko x surprise guest @taylorswift13 pic.twitter.com/hjF21jJrtJ
— Alexa Shouneyia (@ashouneyia) December 6, 2018