Today, Kensington Palace released two new photos of Princess Charlotte, who is now 6 1/2 months old.
The photos were taken by Catherine in mid-November, according to the palace's social media account, at the family home in Norfolk, England.
"The Duke and Duchess of Cambridge are delighted to be able to share two new photographs of Princess Charlotte," the palace said in a statement.
"The Duke and Duchess continue to receive warm messages about Princess Charlotte from all around the world and they hope that everyone enjoys these lovely photos as much as they do."
William and Catherine did the same thing with Prince George last year, as a thank you to the British media for allowing their children to grow up out of the public eye.
Those photos were taken at Kensington Palace by photographer Jason Bell, who also shot the young prince's christening.
"The Duke and Duchess of Cambridge are very grateful for the support they have received when it comes to their children and wanted to share these very charming pictures taken by the Duchess," a royal aide told the Daily Mail. "It is something they intend to continue to do."
Catherine is an amateur photographer, having taken photos of George and Charlotte about a month after the princess's birth.