We take a look at some of this chart-topping monster’s vital signs ahead of her gig in Glasgow. There is surely no doubt in anyone’s mind about Katy Perry’s innate ability to cobble together relentlessly catchy choruses. From the sapphic pop tendencies of ‘I Kissed a Girl’, the punchy pace of ‘Hot n Cold’ or stadium-sized floor-filler ‘Firework’, whether anyone has in fact ‘ever felt like a plastic bag’ is irrelevant, it’s still stuck in your head.Anyone at all familiar with the singer will know of her penchant for adorning herself in, let’s say, ‘risqué’ attire. Notable costume choices include skin-tight rubber dresses, squeezing her every which way but loose (although there have been several close calls) while draping her in equally eye-gouging patterns – from a union jack/stars ‘n’ stripes hybrid to electric pink palm trees.