Like your pop music big, loud and bouncy? American #1 Katy Perry is coming to town for her first UK gig this September. Tickets have just gone on sale for the tiny Water Rats and we're pretty sure that once people clock on it'll sell out really quickly. Added to iTunes yesterday she could be looking at a UK #1 on Sunday with the trashy 'I Kissed A Girl'. Tickets are £7.50 here