Shot by British photographer Nick Knight, the photo showcases the queen sitting stoically in a turquoise jacquard dress and pearls -- teasing just a hint of a Mona Lisa-esque smile -- while her son and heir to the throne, Prince Charles, gazes adoringly in her direction with his hand resting just behind her.
"First look: As a year of 90th birthday celebrations draw to a close, we would like to share this special photo of The Prince and The Queen, taken earlier this year at Windsor Castle," reads the caption.
"I wanted to create a modern portrait that showed warmth and humanity as well as strength and tradition," Knight said of the shot, taken shortly before the Royal Windsor Horse Show last spring at Windsor Castle.
Meanwhile, Prince Charles’ son, Harry, continues to dominate headlines as his growing relationship with actress Meghan Markle, 35, heats up. The pair was spotted Christmas tree shopping in London shortly before the 32-year-old prince accompanied the Suits star to Heathrow Airport for her flight home to Toronto.