It's relatively easy to achieve: Paul Hanlon, stylist at Frédéric Fekkai in New York, gave models this unkempt half French twist in three simple steps—no brush required.
Apply a volumizing spray throughout hair—massaging it into the scalp to lift roots—and finger-comb it under a diffuser. Then backcomb underneath the top half of your hair to create extra height.
Gather together the top half of your hair along the nape of the neck; twist it up and secure, leaving the lower half free.
Pull out a few strands around your face—apply texturizing cream to make them extra wispy. A light misting of hairspray will maintain the bombshell-like volume.