Read previewKing Charles III is staying close with Kate Middleton as both royals grapple with cancer.
Just last month, King Charles was diagnosed with cancer after undergoing a prostate procedure.
Related storiesThe king and princess were both treated during the same period at The London Clinic in January, according to the BBC.
"This of course came as a huge shock," Kate, 42, said in her video message, which was filmed on Wednesday by BBC Studios.
AdvertisementThe Buckingham Palace spokesperson added that King Charles is "so proud of Catherine for her courage in speaking as she did," according to People.
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—, Charles III, Kate Middleton, King Charles, Queen Camilla, Kate, Catherine, she's
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Service, Business, London Clinic, BBC, BBC Studios
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Buckingham