The author of the photo was the world-famous photographer Annie Leibovitz. It was her chosen Buckingham Palace for a memorable photo shoot, which took place on March 28 in the walls of Windsor Castle.Photo:Getty ImagesTo the right of Elizabeth II are her two youngest grandchildren: 12-year-old Lady Louise Mountbatten-Windsor and 9-year-old James Windsor, Viscount Severn, the children of Prince Edward, Elizabeth's youngest son. Next to them is the Queen's 2-year-old great-granddaughter Mia Grace Tindall, daughter of Zara Phillips. At Elizabeth II's left shoulder is her 5-year-old eldest great-granddaughter Savannah Phillips, daughter of Peter Phillips, and a little closer to us in a pink suit is her real sister, the Queen's 3-year-old great-granddaughter Isla Phillips. Between the girls, 2-year-old Prince George is modestly fiddling with his blouse. He is destined to one day become King of Great Britain. And 11-month-old Princess Charlotte is comfortably nestled on Elizabeth's lap. They say that she is the Queen's favorite. In addition to this unique historical photograph, two other works by photographer Annie Leibovitz have been published: a portrait of Elizabeth II with her daughter Anne in the White Drawing Room of the castle and a photo of the queen standing on the steps of the East Garden with her beloved corgis Holly and Willow and dorgis Vulcan and Candy. By the way, the official hashtags for the anniversary of Elizabeth II are #HappyBirthdayYourMajesty and #Queenat90.