Cara said that she had been best-friends with Geneviev, the daughter of Sarah Doukas who owns Storm Mgt, since she was five. Sarah met her when she went to thier school met her through her daughter.With her older sister, Poppy Delevingne, already a model, she had always been so supportive to her. It was strange for her in the beginning with both of them working in the same industry, but she has always helped her and is always there for her. Cara feels that it helps that they are both very similar girls, and that they are very close. She first modeled ten in an editorial shot by Bruce Weber for Vogue Italia alongside model Lady Eloise Anson.


Source: How did Cara Delevingne get discovered as a model? – Quora