'OMG, Is That Blood?' Inside The Byrne Notice Halloween Party With NY Cult

Over the weekend, Fiona Byrne, Zachary Quinto, Atlanta de Cadenet Taylor, Christian Siriano, Ashley Smith, and Bianca Bianconi hosted The Byrne Notice Halloween Party "OMG, Is That Blood?" with NY Cult. The event, which took place at the Mondrian Soho Hotel, attracted some of the coolest names in the fashion industry and beyond, all dressed in their best Halloween attire. For Zachary as Shia LeBoeuf, Atlanta as Marilyn Manson, Fiona as Annie Hall, and more celebs in their killer costumes, be sure to check out our slideshow!

Who was there: Guests included Fiona Byrne, Greg Krelenstein, Atlanta de Cadenet Taylor, Geordon Nicol, Zachary Quinto, Leigh Lezark, Bianca Bianconi, Christian Siriano, Chloe Wise, Donal Brophy, Alexa Chung, Ashley Smith, Brad Walsh, Laura Love, Alana Zimmer, Anna Schilling, Arika Strong, David X Prutting, Jack Guinness, Kori Richardson, Polis Groutas, Sara Blomqvist, Sky Ferreira, Ania Goldberg, Britta Briscoe, Casey Smith, Chau Prutting, David Weinholdt, Elliot Easterling, Jackie Chachoua, Joe Jonas, Cat King, May Kwok, and more.

[Laura Love, Atlanta de Cadenet Taylor by Paul Porter/BFAnyc.com via @bfa_nyc][Zachary Quinto, Fiona Byrne by Paul Porter/BFAnyc.com via @nycfiona] [Joe Jonas, Richard Chai by Paul Porter/BFAnyc.com via @bfa_nyc]