Katy Perry brought her Prismatic world tour to London?s O2 Arena and in true Katy fashion there were certainly some interesting antics happening on stage.
The superstar opened the show inside a prism (of course) whilst singing her mega-hit Roar.
As for the tour attire Miss. Perry sported an eighties look in neon-raver outfits and channeled her inner Cleopatra just like the Dark Horse video.