Jason Derulo was Taylor Swift’s guest performer at the ‘1989 world tour’ in Washington DC last night (July 14).

Taylor and a shirtless Derulo performed the latter’s hit song ‘Want To Want Me’ at the National Park.

“I got to sing my fav summer JAM ‘Want To Want Me’ with @jasonderulo in DC-I’m also loving his new single ‘Cheyenne’!,” Taylor Swift tweeted after their performance.

httpv://youtu.be/7DXFVxM_Vqw