Hailey Bieber looks effortlessly chic in a classic LBD as she parties at Saint Laurent bash during Paris Fashion Week

Kate Moss stands out in purple as she parties with birthday girl daughter Lila and Zoe Kravitz at Saint Laurent bash in Paris

Zoe Saldaña, Rosie Huntington-Whiteley and more stars shock in sheer lace at Saint Laurent fashion show

Bella Hadid’s under-$100 LBD is perfect for fall