Kate Middleton is expected to attend church at St. Mary Magdalene in Sandringham on Christmas Day with Prince William, Prince George, Princess Charlotte and Prince Louis, and this year's appearance will be even more poignant than ever.

From Prince Louis’s well kept “secret” to a nearly missed cameo, Kate Middleton ’s holiday concert was filled with key takeaways. Not only did she sport one of the year’s biggest trends, but she also displayed super-telling body language. There was so much going on, I almost missed these heartwarming photos of her three children.

Ahead of Kate Middleton's Christmas Day walk to St. Mary Magdalene Church alongside her family, a royal style expert reveals why the Princess of Wales might chose a style "nod to Diana" for her final public appearance of the year.