A lot of brides walk themselves up the aisle, due to absent fathers, or just being older when they get married, or on their second marriage.
My brothers walked me up the aisle, since my father was deceased, but that’s not an issue for Crown Princess Victoria.
One time, I saw a bride walk up with both her parents. Her view was that she was acknowledging both their contributions in raising her and preparing her for marriage.
Actually in the Jewish weddings it’s both parens.