We get Blake Lively hair envy, like, every time she leaves the house, and her latest 'do is no exception. If you're looking for some prom/wedding/Saturday-night hair, look no further because this messy side braid is total perfection. We asked ASOS hairstylist Charlotte Pannell for a step-by-step…

1. Rough-dry hair with heat protection spray to create a tousled texture. 

2. Randomly curl half the hair with a medium tong and really shake it out. 

3. Lightly spray the hair with hairspray to give hold and shine. 

4. Braid the hair really loosely to one side. Once tied, shake the braid around so you get lots of pieces to fall out, then pin to secure. Boom!

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