1. To get Allison Williams's hairstyle, apply a shine serum to damp hair. Part you hair off to the side, and then blow dry your hair.
2. When your hair is completely dry, mist it with a heat protectant and use a flat iron to straighten your hair.
3. Pull your hair into a mid-height ponytail and secure with an elastic.
4. Fan out your ponytail, and then roll it under. Secure your hair in place with bobby pins.
5. Finish with a medium-hold hairspray.
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