Celebrity 15 of Birthday Boy Zac Posen's Best Autumn-Inspired Instagrams By Anna Hecht Anna Hecht Anna Hecht is a London-based writer who has covered all things fashion, health, and celebrity news. She currently is an Editorial Director and manages commercial content. InStyle's editorial guidelines Updated on October 24, 2015 @ 07:15AM Pin Share Tweet Email Photo: Neilson Barnard/Getty Images When we think of birthday boy Zac Posen, we often think of A-list celebs wearing his always on-point red carpet gowns. On Instagram, however, Posen's followers also know him for his foodie ways. Using the hashtag #cookingwithzac, the designer turned chef often shares his latest kitchen concoction, which, as of late, has included many fall-themed foods—especially, the pumpkin. And, in addition to sharing his favorite fall recipes, Posen, who turns 35 today, has also upped our excitement over apple-picking season by snapping autumn-themed outdoorsy pics, not to mention his latest designs in warm fall colors. And so, in honor of the iconic designer's autumn birthday, we rounded up the very best of his fall-themed Instagram posts to celebrate the man who's dressed the best in Hollywood. From Caitlyn Jenner to Sofia Vergara and Michelle Obama, the sky is the limit for Posen whose sought after designs have earned him a permanent place in the fashion world. Congrats, Zac! Christina Hendricks Tricks Us with Two Dresses (but It's Actually One) Three Makes a Trend: Lena Dunham Wears Zac Posen For the Third Time