Other moments chosen to join the photo were her Coronation, her Royal Wedding, meeting President John F Kennedy; at the Wimbledon, walking her corgis in the countryside, watching the flypast of RAF Jaguars and her 80th birthday.
Gaga was chosen due to the dress (which The Queen loved) and as a mark of "meeting the biggest popstar in the world."
(quoting one of her royal photographers, not The Queen)
