Katy Perry's FAV new act Disclosure will be chillin' in here ready for their set. This image appears in the gallery:Jingle Bell Ball 2013: What Happened Backstage? 76. Katy Perry's FAV new act Disclosure will be chillin' in here ready for their set. Picture: Andy Squire 80 images See the full gallery: Jingle Bell Ball 2013: What Happened Backstage?