Relive Taylor Swift and Selena Gomez's 15-Year Friendship

After filming "Bad Blood" together, Swift invited Gomez to perform with her on her "1989" tour. They performed a surprise duet of Gomez's single "Good For You," which she dropped in collaboration with A$AP Rocky that June.

Gomez shared her excitement over joining Swift on tour on Instagram. "After nearly 8 years of friendship, I just can't wait to tell our kids we ACTUALLY got to perform in front of thousands of insanely beautiful people together. TWICE! I love you Tay. #bestnightEVER #whatISlife," Gomez wrote alongside a photo of her and Swift on stage.