Model Jourdan Dunn walks the runway at the Burberry Prorsum show during London Fashion Week SS15 on September 15, 2014 in London,England

Model Jourdan Dunn walks the runway at the Burberry Prorsum show during London Fashion Week SS15 on September 15, 2014 in London,England

*Jourdan Dunn says she got a reality check when her son Riley, 4, was diagnosed with sickle cell anemia at just 6-months-old.

She told Vogue magazine: ”I knew there was a possibility that I was carrying a sickle cell baby because both his dad and I have the trait. But of course, I always had it in my head, ‘No, not my baby. That’s not going to happen to me.’ ”

Sickle Cell is an inherited form of anemia — a condition in which there aren’t enough healthy red blood cells to carry adequate oxygen throughout your body.

Jourdan designed a Cell for Gratitude necklace with brand Tuleste to raise funds for the charity SCDAA (Sickle Cell Disease Association of America) and recently threw a star-studded party at New York Fashion Week to raise awareness, where guests included Rihanna, Cara Delevingne and Karlie Kloss.

She said: ”I was so overwhelmed by it all. Before a model, I am a mother. Now, I do my job for Riley.”