Bella Hadid just walked the runway for Haider Ackermann during Paris Fashion Week.Hadid channeled Universal Classic Monster movies and Winona Ryder in Beetlejuice in a bouffant black wig.The model also freed the nipple for Vivienne Westwood.Bella Hadid has already launched so many unforgettable looks in 2020, and her latest runway outfit is no exception.Walking in Haider Ackermann's Paris Fashion Week show, to debut the designer's Womenswear Fall/Winter 2020/2021 collection, Hadid was