The four new photos were taken by HRH The Duchess of Cambridge in April at their home in Norfolk.
"The Duke and Duchess of Cambridge are delighted to be able to share four new photographs of Princess Charlotte," a Kensington Palace spokesman said in a statement. "The Duke and Duchess are very happy to be able to share these important family moments and hope that everyone enjoys these lovely photos as much as they do."
Princess Charlotte is shown walking, or nearly walking, in a couple of the photos.
The Duke and Duchess released a similar photograph of their son Prince George when he was walking at the same age.
Princess Kate reflected on her daughter just before the Queens 90th birthday in a documentary by ITN: "The Queen was really thrilled that it was a little girl, and I think as soon as we came back here to Kensington she was one of our first visitors here,” Duchess Kate said. "It's very special having a new little girl."
She added, "I feel very, very lucky that George has got a little sister."
Prince William expressed his sentiments about his growing family shortly after Princess Charlotte's birth. “It has been fantastic and she has been a little joy of heaven," he said. "But at the same time, it is more responsibility, looking after two little ones, especially when George is around. He’s a little monkey"