The Duchess is a woman of her word.
Visiting London's Royal Marsden Hospital last month, Kate Middleton met with several young cancer patients, one of whom was 9-year-old Fabian Bate.
During their chat, he informed Kate that his family kept a blog, and Middleton vowed to pay it a visit and leave a message. She did, and then some.
Prince William's wife sent out a personalized and heartwarming letter to Fabian, who was diagnosed with leukemia in 2006, which he in turn posted online.
"Despite the enormously demanding course of treatment, I was so touched by your strength of character, and delighted to hear the news that one of your big sisters will be able to donate bone marrow to you later this year," she wrote.
"I will keep my fingers crossed that your health goes from strength to strength over the months ahead," continued Kate. "This must be a troubling time for you, your parents and your sisters, but I know I left The Royal Marsden assured by how incredibly talented, kind and clever the team at the hospital are."
"Combined with your belief and positive energy, you couldn't be in better hands."
She ended the letter as such: "Keep up the good work with the blog and in the meantime I will keep you and your family in my thoughts and prayers."
The touching note was signed, simply, "Catherine."
It's wonderful to know that Kate listens and appears to be so engaged in these public outings and that it's not simply for the sake of positive PR.
Needless to say, Fabian and his family agree.
"It was a very personal letter," his father Darrell told the Evening Standard.
"It certainly didn't look like the standard templates these official letters often use. It contained very specific information she must have remembered."
"We were very touched as she must do a lot of this stuff and to remember Fabian is very moving."
Kate Middleton has been named a patron of the Prince William and Prince Harry Foundation, but has not yet decided which causes to make the focus of her charity work. Whichever ones she does choose will be very lucky, indeed.