Not so mellow yellow? That's right, it's a great day for Queen Elizabeth II and her family, and she is shouting it from the fibers of her bright-yellow Angela Kelly beaded dress with matching coat and hat. Talk about a vibrant, happy outfit fit for the grandmother of the groom. And it's topped with the sweetest accessory: the Queen Mary's True Lovers Knot broach. Awww, pass the tissues!