Britain's Prince Charles and Camilla, the Duchess of Cornwall, arrive for a special concert "The Queen's Birthday Party" to celebrate the 92nd birthday of Britain's Queen Elizabeth at the Royal Albert Hall in London, Britain April 21, 2018. Reuters Britain's Prince Charles and Camilla, the Duchess of Cornwall, arrive for a special concert "The Queen's Birthday Party" to celebrate the 92nd birthday of Britain's Queen Elizabeth at the Royal Albert Hall in London, Britain April 21, 2018. Reuters