Kendall and Kylie Jenner might seem familiar if you've seen Keeping Up With the Kardashians. They're the two younger half sisters of Rob, Kim, Khloe, and Kourtney. Seen in the video are Kendall and Kylie with their BFFs Spencer and Madeline rocking out to Taylor Swift's "Better than Revenge" from her latest record Speak Now. They even have a blooper reel up on their YouTube channel! Check out their video for Miley Cyrus's "Party in the USA," too! What song would you and your friends shoot a video for? Spill in the comments below!