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The bride-to-be revealed she had to find the determination to fight through the pain of scoliosis, which means the spine twists and curves to the side.

During a speech at youth empowerment event WE Day in Wembley, London, on Wednesday, Eugenie said her sister encouraged her to not get “disheartened”.

The princess, daughter to the Duke and Duchess of York, urged women to “live fearlessly” in the face of adversity.

The 27-year-old told the audience: “When I was 12 I was diagnosed with, and treated for, scoliosis and I have lived with two 12 inch metal rods in my back.”