Prince Philip posed for a new photo alongside his wife, Queen Elizabeth II, ahead of his 99th birthday.“This new photograph of The Duke of Edinburgh and The Queen was taken last week in the quadrangle at Windsor Castle to mark His Royal Highness’s 99th birthday tomorrow,” the royal family’s Instagram caption read on Tuesday, June 9.The celebratory snap features Queen Elizabeth, 94, wearing a floral-printed Angela Kelly dress, 18.8 carat diamond brooch called Cullinan V, and a pearl necklace.