Prince Harry all smiles as he arrives at WellChild Awards in London

Prince Harry made an emotional visit to Windsor Castle to visit the grave of his late grandmother - Queen Elizabeth II - just moments after he touched down in Britain for a four-day trip. The Duke of Sussex headed to St George's Chapel today to pay his respects on the third anniversary of the late monarch's death, while brother William and Kate attended their own engagement just eight miles away in Sunningdale, Berkshire.