Last night, the world's biggest music stars got invited to perform to ring in the new year.
You can click HERE to see Justin Bieber, Taylor Swift, and Carly Rae Jepsen perform. And now here are some more…
Psy performed with MC Hammer. They sang "Gangnam Style", of course! He tweeted "How was #HammerTime in Times Square!??"
Ke$ha sang "C'mon" for MTV's New Year's Eve. It's her new single from her album Warrior.
Rita Ora performed "How We Do" at the same event. It looked like she had so much fun! Her song is right after a small interview with Snooki and Ne-Yo at around 2:15.