Prince William and Kate's royal presence at Olympics

Catherine, Duchess of Cambridge, and Britain's Prince William, the Duke of Cambridge, watch the equestrian eventing cross country phase at the 2012 Summer Olympics in London.

Britain's Prince William and his wife Catherine celebrate with Peter Phillips (L), son of Princess Anne, as Kristina Cook finishes competing in the Jumping Phase of the Eventing competition of the 2012 London Olympics at the Equestrian venue in Greenwich Park, London.

Members of the British Royal family from left to right: Princess EugenPrincess Beatrice, Kate Middleton the Duchess of Cambridge, Prince Harry, Mike Tindall, husband of competitor Zara Phillips, and Peter and Autumn Phillips chat after Britain's Zara Phillips won a silver Medal in the equestrian team eventing at the 2012 Summer Olympics at Greenwich Park, in London.

Britain's Prince William, left, his wife Kate Middleton the Duchess of Cambridge, center, and Prince Harry, right, watch the show-jumping phase of the equestrian eventing competition at the 2012 Summer Olympics at Greenwich Park in London.

Camilla, Duchess of Cornwall, and Catherine, Duchess of Cambridge, watch the equestrian eventing cross country phase at the 2012 Summer Olympics in London.

The Duchess of Cambridge with the President of Mongolia Elbegdorj Tsakhia, left, and Erdene Elbegdorj at a reception at Buckingham Palace, London, to welcome Heads of State and Heads of Government to the UK before they travel to the Olympic Stadium for the Opening Ceremony of the London 2012 Olympic Games.

Kate Middleton, Duchess of Cambridge, laughs as she visit Bacon's College in London to launch the Coach core programme for the sports charity Greenhouse.

Prince William, Duke of Cambridge, and Catherine, Duchess of Cambridge, stand next to Prince Harry during a torch relay from Wai-Ming (L) to John Hulse (R) at the Buckingham Palace in London during a torch relay on the eve of the London 2012 Olympic Games.