The pretty girls of Rainbow were recently spotted backstage at one of the music programs performing their own little performance of 2PM’s hit song Heartbeat. Their performance was cute and brought a smile to my face. It’s good to see the girls having so much fun backstage. Check out the performance below: [video=youtube;9r40pUlesJE]http://www.youtube.com/watch?v=9r40pUlesJE"[/video] Credit: allkpop
