Taylor Swift seems to be working her way through Songs of Summers both present and past during her 1989 tour. On Monday, she brought Lorde out for a stirring rendition of her 2013 hit “Royals,” but last night, Swift invited recent SPIN interviewee Jason Derulo onstage with her in Washington D.C. to perform his massive current hit, “Want to Want Me.” It ended with the Everything Is 4 star removing his shirt while Swift cackled next to him, harmonizing the whole time. Watch fan-shot footage of the jolly good time.

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