The 18-year-old daughter of actor Stephen Baldwin and niece of Alec Baldwin starred in Moschino's Autumn/Winter 2015 menswear show alongside British beauty Jourdan Dunn.
Dressed in a metallic trousers, a leopard print bra, a beanie and ski goggles, it was hard to miss Hailey modelling Jeremy Scott's latest designs for the Italian fashion house.
But it's not the first time she's hit the catwalk in London - her appearance comes after she walked in Topshop's Spring/Summer 2015 show. She also starred in Love magazine's 2014 calendar in December.
With a circle of friends that includes model of the moment Kendall Jenner and fellow rising star Gigi Hadid, plus a contract with Ford Models under her belt, this is just the beginning of a successful career in fashion.
"When I got this job, I kind of screamed... well, okay, I literally screamed. I'm so excited," Hailey told US Elle before her London Fashion Week debut in September. "I'm also a little scared, to be honest. But I trust Ford, my agency, more than anybody. They've seen models through their careers time and time again. They said I was ready, so here I go. Even though I'm really nervous!"
Something tells us Hailey doesn't have anything to worry about.
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