Watch: Kate Middleton Makes Surprise Appearance During Outing With Prince WilliamThe royal family is continuing on with their duties. Less than a month after King Charles' brother Andrew Mountbatten-Windsor-formerly Prince Andrew-was arrested Feb. 19, the British monarch stepped out for the annual Commonwealth Day service at Westminster Abbey March 9 alongside his son Prince William and Kate Middleton. In photos from the annual celebration, which honors the 56 countries included in the Commonwealth, Kate and William donned similar hues of blue as they made their way into the London church.