Meghan Markle is throwing it back to mark her son Prince Archie's 7th birthday! The Duchess of Sussex, 44, shared an adorable baby photo of Archie to Instagram on Wednesday, May 6, as the little prince celebrated another turn around the sun. In the pic, doting dad Prince Harry, 41, can be seen with baby Archie resting on his chest as he looks down dotingly at his firstborn. Meghan didn't leave Archie's sister, Princess Lilibet, out of the social media celebration, however. In a second snap, shot from behind, Archie and Lilibet, 4, can be seen frolicking on the beach.