London-born, Dunn made headlines in 2008 as the first black model to walk for a Prada show in more than a decade. Discovered while shopping with a friend at Primark in Hammersmith, west London, Dunn signed to Storm Models in London and Women Management in New York.
She has walked in Marc Jacobs, Ralph Lauren and Salvatore Ferragamo shows in New York and Milan and has since been voted the British Fashion Council's "Model of the Year." She was also one of four cover models selected for Italian Vogueâ€™s iconic "Black Models" issue, and has been featured in American, Italian, Russian, French, Japanese and British Vogue.
In 2011, Dunn became the face of Burberry and signed a cosmetics contract with Yves Saint Laurent.