Jen Atkin, the stylist who did Jessica Alba's hair for the red carpet, recommends doing this look on second-day hair. She used Dry Bar Dry Shampoo ($20) on the roots for a tousled texture. Then she pulled the front half of Jessica's hair into a high topknot. The back of the hair was French-braided upward, with the ends tucked under the topknot.
As a finishing flourish, Atkin added a few arrow barrettes from Fallon jewelry. "I loved these because the sharp edges on the arrows evoke a safety pin vibe, which is a punk rock staple," she said.