LONDON, UNITED KINGDOM - AUGUST 04: The Queen Looking Thoughtful Arriving At The Royal Opera House In Covent Garden For A Celebration Of Her Mother's 101st Birthday. (Photo by Tim Graham/Getty Images)

LONDON, UNITED KINGDOM - AUGUST 04:  The Queen Looking Thoughtful Arriving At The Royal Opera House In Covent Garden For A Celebration Of Her Mother's 101st Birthday.  (Photo by Tim Graham/Getty Images)