Catherine added: “Lifting spirits through laughter, fun and play, as well as listening, holding, caring and sharing, they support children and families through life, death and beyond.”
Each has hospices in Cambridgeshire, Norfolk and Suffolk.
Its chief executive, Kevin Clements, said: “We’re so incredibly grateful for the princess’ invaluable contribution as our dedicated royal patron.
“Her ongoing support and vast profile have projected our charity on to the global stage and this latest message is a perfect way to mark Children’s Hospice Week.”
Children’s Hospice Week, led by Together for Short Lives, is a week-long focus on fundraising and the work of children’s hospices.
They provide a range of essential services including physiotherapy, music therapy, 24-hour telephone support and short-break care.