Prince Harry claims in his new book, Spare, that his father the King carried a teddy from his troubled boarding school days.
Charles will be crowned King amid full pomp and ceremony on 6 May.
The Queen famously mourned her husband Prince Philip alone during his funeral in April 2021.
The star's son died earlier this year.
The monarch traditionally addresses the nation on 25 December.
‘King Charles III’ has ruffled feathers because it depicts the Duchess of Cambridge as a chain-smoking Princess who is scheming to become Queen and it raises the question of Prince Harry’s paternity. The drama has been adapted from the award-winning play of the same name by Mike Bartlett, and concerns over its content were first brought to light in a Daily Mail article over the weekend that featured Diana’s friend Rosa Monckton, who said that the Prince Harry paternity storyline was ‘deliberately causing pain to a real living person in a salacious fashion’. Charlotte Riley, who plays Duchess Kate, described her character in the one-off drama as the driving force behind the heir apparent.