Its absolutely amazing what one can do these days and hence, it’s fashionable. We cannot regard the style as "messy" if the base of it has a smooth brushed look about it. Therefore, the only logical approach would be to finger rake a ‘messy do’ from the beginning so the overall look about the style is true to it’s reference. Starting with this very thing in mind, Kate Beckinsale, has banded and landed a ‘messy bun’. Along the bottom of said bun, tendrils were loosened for effect and then either curled or natural ones encouraged. Hairspray lightly where and when needed.