Katy Perry is HOT off her performance on SNL this weekend. She's building up to the release of her brand new album 'WITNESS'. She stopped by The Late Late Show to do Carpool Karaoke with James Corden! Of course the singing was amazing but the highlight had to be when Corden asked her about her ongoing 'beef' with Taylor Swift. She doesn't talk about it very often but with James she must have felt really comfortable. She said that the beef was started by Taylor Swift and it's time for HER to finish it! She even said that she tried to have a conversation with her and Taylor shut her down.