Princess Madeleine of Sweden and her husband, Christopher O'Neill, welcomed their third child [1], a baby girl named Princess Adrienne, on March 9, and she could not be any more precious. Shortly after her birth, Madeleine shared an Instagram snap of Princess Leonore, 4, and Prince Nicolas, 2, welcoming their little sister home [2]. She then followed up the sweet moment with an adorable photo collage [3] to mark her one-week birthday. Is your heart melting yet?