Kate Middleton often takes photos of her children to release on their birthdays. The proud mum published an image of Prince George just last week, as the family celebrated his ninth birthday.
Many royal fans remarked how much the young prince looks like his dad Prince William. Equally, when Charlotte turned seven in May, many commented on her likeness to her father.
As reported by The Mirror, this has led to the Duchess of Cambridge joking that Louis is the only one of the three kids that actually looks like her. A friend of Kate said: "Everyone always comments on how Louis is the spitting image of Kate.