Britain's Queen Elizabeth II (L) and Britain's Prince Philip (R), Duke of Edinburgh wave to guests as they are followed in a convoy by Britain's Prince William, Duke of Cambridge, Britain's Catherine, Duchess of Cambridge and Britain's Prince Harry as they attend the Patron's Lunch on the Mall, an event to mark her 90th birthday in London on June 12, 2016. / AFP / POOL / TOBY MELVILLE (Photo credit should read TOBY MELVILLE/AFP/Getty Images)
