Last night as Pop UK [1] and Fab UK partied [2] with Keira Knightley, Sienna Miller and Elle magazine [3] to celebrate The Edge of Love film, they noticed a disheveled up-do trend emerging. Ok, so they didn't actually say it in those words, but that's beauty girl talk for – "Look Keira and Sienna have remarkably similar hair styles tonight!"

Keira's asymetric knot was bang on the money in terms of being prettily on-trend and I thought Sienna's messy chignon looked perfect for her bobo (boho bourgeoisie) style. It's a tough choice, but which do you prefer? Sorry, I'm not giving you a 'both' choice either this time, c'mon girls - you choose...

Source [4]