Katy Perry, Miley Cyrus, Adam Lambert, Selena Gomez, Jamie Lynn Spears and friends attend the Britney Spears "Piece of Me" residency concert at Planet Hollywood in Las Vegas, NV. December 27, 2013.
Age is just a number for Kylie Jenner.
We all know Taylor Swift likes to dance. But, did you know she could break it down like THIS?