In fact, we probably shouldn't rule out the theory that Angelina is simply adopting or biologically spawning children as backup for the inevitable moment when she realises she has no available flesh left. Yet it seems she will at least endeavour to fill up Brad Pitt's defaceable torso first. The first Brad unveiled was a forearm tattoo of Otzi the iceman. The second was a mysterious series of parallel lines that were diversely interpreted as a tribute to the great Nintendo platform games of the 80s, and a diagram of the New Orleans levee system. As it turned out, the speculation was way off target: Angelina herself had created the cryptic hieroglyph. "We went to Davos," she said. "One night we didn't have anything to do, so I was drawing on his back. It's meaningful in that it's us making angles and shapes out of each other's body, that kind of a thing." No. That is not why it is meaningful. It is meaningful because the kind of people who get so bored that they doodle on each other and turn the doodles into permanent tattoos are now attending the World Economic Forum.Marina Hyde on how celebrities have taken over.