We couldn't help but wonder if this week's best dressed had Halloween on the brain when putting their ensembles together (It might just be us). Aurel Schmidt partied at the Whitney in a witchy black sparkly number. Kate Bosworth and Lauren Santo Domingo both wore Proenza dresses with Halloween colors. Leighton Meester could have been dressed as Blair Waldorf in this Elie Saab frock. And Keira Knightley's Valentino dress is...so pretty it's scary?