[6] Campbell started modelling after she appeared in a Vogue feature by Mario Testino, in a story about up and coming young Londoners.

Campbell has appeared in advertising campaigns for Burberry, Cacharel, Christian Dior, Marc Jacobs, Bottega Veneta, Karl Lagerfeld, Lanvin, Alexander McQueen, Hugo Boss, Yves Saint Laurent, Jil Sander and Louis Vuitton.

[10] She has walked the runway for prestigious fashion houses such as Burberry, Hermès, Chanel, Christian Dior, Calvin Klein, Balenciaga, Givenchy, Alexander Wang, Louis Vuitton, Paco Rabanne, Hugo Boss, Valentino, Marc Jacobs, Bottega Veneta, Sacai, Alberta Ferreti, Haider Ackermann, Stella McCartney, Alexander McQueen, Fendi, Versace, H&M, Jil Sander, Lanvin, Loewe, Mugler, Chloé, Celine, John Galliano, Miu Miu, Isabel Marant, Victoria Beckham, DSquared, Giles, Balmain, Etro, Jacquemus, Cacharel and Yves Saint Laurent,[11] and has also been featured in fashion stories and cover shoots for publications such as Numero, Love Magazine, British Vogue, Italian Vogue, W and American Vogue.

[12] A long-standing favourite of Karl Lagerfeld,[13] Campbell was given "one of the ultimate modelling accolades", when she closed the Chanel Spring/Summer 2012 couture show as the "bride".

[23] In January 2018 Campbell took part in a question-and-answer season at London's Dover St Market hosted by Love magazine to take this discussion further.

Her father is Roddy Campbell, a hedge fund manager; her mother is the architect, Sophie Hicks[26] Her younger sister, Olympia, is also a model.

[28] She is an accomplished jockey, and took part in Glorious Goodwood in July 2011, becoming the first winner of the inaugural all ladies charity horse race, The Magnolia Cup,[29] a feat she repeated on See the Storm in 2014.