We're getting our first look at the new prince as he settles into his new home this weekend.
The image of Prince Louis was taken on April 26, three days after his birth.
In a statement Kensington Palace said, "The Duke and Duchess of Cambridge are very pleased to share two photographs of Princess Charlotte and Prince Louis. Their Royal Highnesses would like to thank members of the public for all of the kind messages they have received following the birth of Prince Louis, and for Princess Charlotte's third birthday."
Kate, a keen photographer, has taken several photographs of her young children and shared them with the public over the years, including George and Charlotte’s first days at nursery school and Charlotte's first birthday.
The last time the public saw Prince George and Princess Charlotte was the day of Prince Louis' birth. Charlotte gave a confident wave to the crowd while her more shy brother, the future king, was brought by Prince William to see their newborn baby brother shortly after Kate gave birth.