You've already seen UK singer-songwriter Ellie Goulding discuss her improbable performance at JFK Airport's Terminal 5. But we also got the singer to talk about the importance—and fun—of performing cover songs and touring with Katy Perry. "She's known my music, so it was really good to tour with someone who knows me and is aware of my songs," said the singer. "She's the perfect pop star." Check out the full interview in the video above.