Kate Middleton and Prince William’s Instagram account has reached 13.5 million mark.

The official Instagram account of the Duke and Duchess of Cambridge hit 13.5 million followers on Instagram after Kate Middleton shared a couple of pictures of the couple’s son Prince Louis.

The Duchess posted the pictures which she took recently on the fourth birthday of her son.

The first two pictures posted ahead of Louis’s birthday were liked by almost a million people on the photo and video sharing application, a milestone the couple’s post rarely reach.