And apparently that’s okay, if you are a 25-year-old model or a reality TV star like Kylie Jenner who is famous for a lip gloss range and looking like a cardboard cutout of her sister Kim – albeit a younger, shinier version.
But not if you are a 57-year-old popstar Madonna who turned up in a revealing Givenchy outfit that showed her bum cheeks and her breasts, covered with some black lace.
I wasn't surprised Madonna turned up showing her bum. I would have been disappointed if she hadn't. Madonna's career has always been about theatre. And costume. She has reinvented her look countless times and it's almost always been outrageous.