Go Behind the Scenes of Katy Perry's Mammoth Prismatic World Dec 22, 2014 18:51:16 GMT -8 Quote Select PostDeselect PostLink to PostMemberGive GiftBack to Top Post by bot on Dec 22, 2014 18:51:16 GMT -8 Go Behind the Scenes of Katy Perry's Mammoth Prismatic World Tour www.rollingstone.com/music/videos/behind-the-scenes-katy-perry-prismatic-world-tour-20141222