Rachel Zoe rocked a super-chic sequined maroon YSL jumpsuit at the launch of Zoe Media Group in Hollywood on Tuesday, but it was the 40-year-old designer's hairstyle that really turned heads.

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"Her maj disco era jumpsuit inspired the half-braid, side pony," Zoe's stylist (and BFF) Joey Maalouf tells Us Weekly. "It screamed holiday party!"

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To recreate her look, Maalouf says to start with air dried or day-old hair. Make a deep side part then French braid two sections of hair on each side until they meet at the nape of your neck. Pull the left over hair into a ponytail and secure with an elastic band. Take a 1-inch curling iron and curl the center section of the hair, leaving out the ends.

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And to score Zoe's signature waves, Maalouf uses Oribe Apres Beach Wave and Shine Spray, a Sultra Curling Iron and Fekkai Coiff Tousled Wave Spray. "Don't take this look too serious, it's meant to be messy and sexy!" he says.

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