Kate Middleton's style has sold out shoes, clothes, and handbags. Now that the Duchess of Cambridge will be dressing a son, will the baby boy be a stylish royal?

The Duchess, who enjoys mixing affordable fashion with high-end pieces might apply the same approach to her son. And who knows, with a little boy, Prince William might have a strong influence on his yet-to-be-named offspring?

Before the Duke and Duchess of Cambridge start planning their son's wardrobe, they'll have lots of inspiration to draw from. Here are some of the most fashionable royal children.

Prince Frederik and Princess Mary of Denmark have four beautiful children. With his scene-stealing poses and smart school clothes, seven-year-old Prince Christian of Denmark looks ready for a children's clothing advert. Aussie Princess Mary, who is also admired for her sense of style, outfits her son in neat sweaters, perfectly pressed trousers and jackets - pocket square included! Prince Christian just needs to watch out. It looks like his siblings, Princess Isabella, and twins Prince Vincent and Princess Josephine won't be outdone.

King Willem-Alexander and Queen Maxima of the Netherlands have three daughters. Catharina-Amalia, Princess of Orange and her sisters Princess Alexia and Princess Ariane. The royal trio made a lovely sight during the inauguration of King Willem-Alexander in April. The girls wore matching yellow dresses and headbands as they greeted crowds from the Royal Palace. They also changed into vibrant blue dresses that matched Queen Maxima's breathtaking Jan Taminiau gown at the Investiture Ceremony.

Princess Marie Chantal of Greece is at the helm of Marie Chantal, designer clothing for children. Her five children with Prince Pavlos of Greece, with their healthy glow and relaxed style, are her best brand ambassadors.

Prince Felipe and Princess Letizia of Spain's two girls take after their stylish mother. Infanta Leonor and Infanta Sofia bring a double dose of colorful frocks and adorable smiles. Whether on holiday or in the city, Princess Letizia's girls always step out in either the exact same dress, or outfits that share a theme.

Start the slideshow for a look at fashionable royals - children's edition!

Kate Middleton