Giving Psy a break from performing, and to change his outfit, YG Entertainment's popular girl group 2NE1 took to the stage and the Happening concert in Seoul.

The ladies gave a very high energy performance, running and jumping and dancing all over the enormous stage.  

They performed two of their popular singles, "I Am the Best" and "Can't Nobody."

2NE1 had the whole crowd dancing and jumping around.  CL and Minzy were head-banging and doing provocative dance moves on stage.

Surely, fans of Psy, who have never before known 2NE1, will be fans of theirs after the Happening concert.