A body language expert has said Prince George and Princess Charlotte appeared to be "shy" as they arrived in Cardiff for a Platinum Jubilee engagement with their parents.The Duke, 39, and Duchess of Cambridge, 40, decided to show the ropes of a royal engagement to George, eight, and Charlotte, seven, as they met several performers and crew taking part in a Platinum Jubilee celebration concert taking place in Cardiff Castle. Both of the young royals appeared a lot more shy, compared to their usually colourful personalities, with the gravity of the occasion clearly having an impact on them – with Princess Charlotte only reaching out to shake hands after some encouragement from her mother, Kate.