Homebalmain Kourtney Kardashian in black halterneck jumpsuit at Cosmopolitan 50th birthday celebration wantherstyle Wednesday, October 14, 2015 WHO: Kourtney Kardashian at Cosmopolitan 50th birthday celebration in West Hollywood on October 11 2015 WHAT SHE WORE: Kourtney wore black halterneck jumpsuit from Balmain BUY: JUMPSUIT: BALMAIN PLEATED STRETCH JERSEY HALTERNECK JUMPSUIT at Net-a-Porter at Selfridges JavaScript is currently disabled in this browser. Reactivate it to view this content. balmain celebrity fashion fashion jumpsuit kourtney kardashian red carpet what she wore Facebook Twitter