CELEBRITY 08/01/2011 08:37 am ET Updated Oct 01, 2011 Kendall And Kylie Jenner Sing Along To Katy Perry's 'Firework' (VIDEO) CELEBUZZ! Apparently, the Kardashian clan has a big old crush on Katy Perry, because they keep doing cover videos of her songs! Download Read more on CELEBUZZ! MORE: Kendall Jenner Kendall And Kylie Jenner Kendall And Kyle Katy Perry Kendall And Kylie Firework Video Kylie Jenner Subscribe to the Entertainment email. Home to your favorite fan theories and the best movie recs.