Queen Camilla disclosed that King Charles' health is showing signs of improvement amid his cancer diagnosis.

Prince Charles, Camilla
(Photo: Chris Jackson/Getty Images)

During a garden party at Lamb House in Rye, Camilla engaged in conversation with attendees while enjoying a performance by actors Timothy West and Hayley Mills.

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The Queen mentioned that her spouse, while unable to accompany her due to prior engagements at Buckingham Palace, expressed disappointment at missing out on events in East Sussex, particularly given his fondness for author EF Benson, associated with the property.

Camilla, 76, said the king is "getting better," but with this one caveat. "Well, he would be if he behaved himself," she continued, according to The Times of London. 

King Charles and Queen Camilla
(Photo by Rob Jefferies/Getty Images)

Following encouraging progress in his battle against cancer, Charles, 75, resumed his public duties earlier this month. Despite positive updates, the king continues to undergo treatment for the disease.

Camilla's visit to the South East England county was themed around literature, sharing her fantasy of visiting Hogwarts — a fictional place — during the Charleston Festival.

The Queen's public appearance preceded a surprising moment at the Royal Opera House, where the King unexpectedly joined performers onstage, hand in hand, during a gala commemorating the conductor of his coronation.

The occasion honored Sir Antonio Pappano's remarkable 22-year stewardship as music director of The Royal Opera.

Camilla, Prince Charles
(Photo: Andrew Matthews - WPA Pool/Getty Images)

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Following the show's conclusion, which was met with a standing ovation, Charles and Sir Antonio engaged in a conversation, reminiscing about the events that transpired since last May's coronation.

"He was just so generous in his praise, and genuinely so, and that means everything, he loves music," Sir Antonio said. "He knighted me, and I've done several events at Buckingham Palace over the years where he's been the engine for those things, and of course I conducted at the coronation, so we've done quite a few events."