Balmain X H&M
Photos: Instagram

Tonight officially kicked off the launch of the highly-anticipated Balmain x H&M collaboration. In true Olivier Rousteing style, the collection launched with a star and model-studded runway event in New York—with Kendall Jenner, Gigi Hadid, Jourdan Dunn, Karlie Kloss and more hitting the runway. And how else does Rousteing ring in one of the biggest fashion collabs of the year? By closing off the runway show with a surprise Backstreet Boys reunion performance, of course. See the best Instagrams from the show, surprise performance and after party below, plus see the full Balmain x H&M lookbook here.

The Balmain Army

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Goodnight #balmainarmy also we watched backstreet boys

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Karlie Kloss, Kendall Jenner and Sam McKnight

Kylie Jenner watches on as Kendall opens the show.

The Backstreet Boys put on a surprise performance.

Karlie Kloss

Olivier Rousteing poses with Kendall Jenner, Gigi Hadid and Dudley O’Shaunessy

Coco Rocha