PARTIESPhotos: Balmain x H&M Takes Over NYCWith the Backstreet Boys, burgers, and a couple of Jenners.by Sue Williamson10.21.151Olivier Rousteing and Kendall Jenner. Photo by BFA.com.2Kylie Jenner and Lewis Hamilton. Photo by BFA.com.3The Backstreet Boys with Olivier Rousteing and Ann-Sophie Johansson. Photo by BFA.com.4Gigi Hadid, Kendall Jenner, and Jourdan Dunn. Photo by BFA.com.5Rosie Huntington-Whiteley. Photo by BFA.com.6Models backstage with Olivier Rousteing. Photo by BFA.com.7Alexa Chung. Photo by BFA.com.8The Backstreet Boys at the H&M x Balmain fashion show.Photo by BFA.com.9Diane Kruger. Photo by BFA.com.10Ellie Goulding. Photo by BFA.com.11Julia Restoin Roitfeld. Photo by BFA.com.