Tonight at Jack Antonoff’s annual Ally Coalition benefit concert, Taylor Swift made a surprise appearance. She joined Hayley Kiyoko for a performance of the Reputation track “Delicate.” Watch it happen below. The Ally Coalition is a nonprofit that aims to take action on LGBTQ equality.

The night also featured previously announced performances from Lana Del Rey (which included the debut of new music), Mitski, Bleachers, Rostam, and Regina Spektor. During Rostam’s performance, he covered the Van Morrison classic “Astral Weeks.”

Read about Swift’s recent political activism in “A Brief History of Musicians Getting Out the Vote” on the Pitch.