Princess Diana
"I am sure you are watching over us always," Ferguson said of the late Princess of Wales.
The actor said he approached Diana about a potential role in a planned follow-up to the 1992 romantic drama.
The prince's dry comments have gone viral since Friday.
Who knew one could copyright a necklace?
A flashback involving Prince William and Princess Diana in the final batch of episodes has already got people talking.
The scenes in question have proved to be one of the most controversial aspects of the Netflix drama's final season.
A vision of the late Princess appears before Prince Charles and The Queen in the sixth and final season of the hit Netflix drama.
Season six of Netflix's royal drama will portray the Princess of Wales’ final days.
The final instalment of the hit Netflix drama will cover some of the biggest moments in the royal history, including the death of Princess Diana.
The final season will document the final weeks before, and aftermath of, Princess Diana’s tragic death.