Although she's only 21, Jessica Stam's CV makes it seem like she's been around forever. She's worked with all the world's top photographers, featured on the cover of numerous magazines, including a whopping six covers for Italian Vogue, and featured in ad campaigns for Prada, Miu Miu, Marc Jacobs, Dolce & Gabbana, Burberry and H&M to name but a few. But forget all that, you know a girl is going to be really big when Marc Jacobs names a bag after her (the Marc Jacobs Stam).