By InStyle Staff
Sep 17, 2009 @ 9:00 am
Imaxtree; Chance Yeh/PatrickMcMullan; Dimitrios Kambouris/WireImage

Gossip Girl fashionistas Blake Lively and Leighton Meester lined the front rows at several of the week's hottest shows. Plus new runway from Michael Kors, Oscar de la Renta, Tory Burch and more!

• Blake Lively and Becki Newton pose at Marchesa
• Leighton Meester in Proenza Schouler's front row
• See all the stars including Emmy Rossum, Ashley Olsen, Rachel McAdams and more

• Michael Kors
• Oscar de la Renta
• 3.1 Phillip Lim
• Peter Som
• Marchesa
• Anna Sui
• Proenza Schouler
• Tory Burch