8. The 'Roar' singer to bring a bit of jungle fever to the #CapitalJBB! This image appears in the gallery:Katy Perry At The Jingle Bell Ball 2013: 13 Things To Expect 8. 8. The 'Roar' singer to bring a bit of jungle fever to the #CapitalJBB! 13 images See the full gallery: Katy Perry At The Jingle Bell Ball 2013: 13 Things To Expect