Popsugar Entertainment Gossip Girl Gossip Girl Costume Ideas Spotted: Nostalgic Gossip Girl Halloween Costumes October 25, 2017 by Laura Marie Meyers View On One Page Photo 2 of 12 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 2 Serena van der Woodsen What to wear: A super-short, form-fitting dress, a chunky necklace, and a perfectly messy do. How to act: Casual and cool, as if you don't even notice that you're the It girl in the room. Related: 30 Serena van der Woodsen Faces For Any Occasion Previous Next Start Slideshow Gossip GirlHalloweenNostalgiaHalloween CostumesTV