To help celebrate its decade of existence, Nylon Magazine invited all its fabulous friends to the Thompson LES Hotel in New York City last night. Who made the guest list? Christian Siriano, Alexandra Richards, Ciara, Marc Jacobs's fiance Lorenzo Martone, and Taylor Momsen, who announced she's designing costumes for her rock band's upcoming tour. As with any other birthday bash, a yummy (and pink!) birthday cake was on hand, as were drinks, clothing, and makeup. Happy 10th birthday, Nylon. May you live to be 100.