Jason Derulo in the JBB studio before he performs in front of 16,000 screaming fans This image appears in the gallery:Jingle Bell Ball 2013: What Happened Backstage? 14. Jason Derulo in the JBB studio before he performs in front of 16,000 screaming fans Picture: Matt Crossick 80 images See the full gallery: Jingle Bell Ball 2013: What Happened Backstage?