I voted for Beatrice Borromeo. I know the outfit got mixed reviews, but I loved it. It's a such a cute casual outfit and I thought the color and fit were prefect for her.
I also loved Princess Charlene's outfit, Queen Letizia's black and white dress from the 18th and CP Mary's outfit from the 20th.
While I did like Queen Letizia's outfit from the 20th (the color combination was lovely), I thought the see-through shoes ruined the entire look.