Princess Eugenie was sporting union jack nails during the celebrations

LONDON, ENGLAND – JUNE 05: Princess Eugenie (nail detail) attends a reception at Guildhall on June 5, 2012 in London, England. For only the second time in its history the UK celebrates the Diamond Jubilee of a monarch. Her Majesty Queen Elizabeth II celebrates the 60th anniversary of her ascension to the throne. Thousands of wellwishers from around the world have flocked to London to witness the spectacle of the weekend’s celebrations. (Photo by Chris Jackson/WPA-Pool/Getty Images)