Watch: Katy Perry explains feud with Taylor Swift on Carpool Karaoke with James Corden

Singer songwriter Katy Perry joined James Corden on his lively and popular "Carpool Karaoke" segment on "The Late Late Show" and explained for once and for all the source of the bad blood between her and singer Taylor Swift. Perry, who sang along with Corden vigorously through "Firework," "Dark Horse" and "Roar" as well as...  WATCH

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