Kate Middleton has left a young girl who invited Prince George to her birthday party with an "amazing" keepsake after writing back to her.
The mum-of-three, along with the Duke of Cambridge, receive a huge amount of fan mail from members of the public and are unable to respond to every piece of correspondence.
But Kate and Prince William ensured the girl, who asked several months ago if their eldest son Prince George could attend her sixth birthday party, received a heartfelt letter in the post thanking her for the invite.
The Express reported that the youngster's delighted mother shared the letter on Twitter, writing: “Something amazing for her to keep.”
The touching letter read: “The Duke and Duchess of Cambridge have asked me to thank you for your letter, in which you invite Prince George to your 6th Birthday party. I am sorry that it took so long to reply.
“Their Royal Highnesses were extremely grateful for your kind invitation. Having given careful consideration to the possibilities, however, I very much regret that Their Royal Highnesses reluctantly feel they have to decline.
"Nevertheless, I hope that you enjoyed your birthday.”
The thoughtful letter went on: “The Duke and Duchess of Cambridge were immensely touched that you should take the trouble to write as you did to their son, Prince George.
"It really was most thoughtful of you and Their Royal Highnesses have asked me to send you their warmest thanks and best wishes.”
Prince George recently celebrated his ninth birthday party, with the young royal said to have enjoyed his day with family and friends.