The royal used her booking powers to get Dame Judi Dench on the show.
It's the first time the duchesses have carried out an engagement together, without their husbands.
The Duchess of Cornwall helped announce the winners of the BBC Radio 2 short story competition 500 words.
Charles is said to be doing a series of bodyweight exercises each day to keep fit.
The duchess plays the ship's captain and will be in the same episode as Lupita Nyong’o.
The Duchess of Cornwall has revealed she is keeping in shape by walking – and doing online ballet classes.
The Duchess of Cornwall has shared a picture which reveals her work from home set up.
The Duchess of Cornwall also said she had friends who had been victims of domestic violence as she met survivors at a reception in Buckingham Palace.
She says it’s the palace’s job to encourage Meghan and Harry to become “less Hollywood glamour and more royal."
The Duchess of Cornwall has divided the public's opinion of her over the years. While she has been embraced more, she still only ranks as the 10th most popular royal in a recent survey. Royal commentator Victoria Arbiter tells us why she thinks the public should cut her some slack on The Royal Box.
Camilla Parker Bowles and Prince Charles have been married for 14 years, but there's still a debate about what her future title will be when he becomes king. Historian Kate Williams explains what the palace's official stance is on this on The Royal Box.