Prince Charles Will Be A 'Good King'; Camilla Is Undervalued, Royal Author Says

A biographer of Princess Diana recently praised Prince Charles and his wife Camilla, Duchess of Cornwall.

While promoting her new book on the British royal family, "The Palace Papers," royal author Tina Brown weighed in on the Prince of Wales' future as the next monarch of the U.K., telling Page Six that she believes he will become a "good king."

She pointed out that Prince Charles' long-held beliefs about the environment and organic farming were once seen as unusual but are now mainstream.

"I actually think he's going to come into his own when he becomes king," she predicted. "He's very authentic. He's always had his eccentric passions, but he's also been very prescient, very ahead of the curve. He's no longer seen as cranky, he's seen as correct."

Brown went on to say that she believes Prince Charles will become king when "everyone's belief in his ideas has come around full circle."

She added that she's convinced the heir to the British throne will be "a very authentic voice and probably a very powerful voice as a global leader in the climate change issue."

As for his wife, Brown did not hide her fondness for the Duchess of Cornwall. The royal author described Camilla as a "tough" and "stoic" person who has managed to keep her sense of humor despite being ripped by the press.

Brown also shared that what she likes most about Duchess Camilla is how the royal has stuck to the royal family's motto about not whining.

"I think she's a really undersung character," Brown said of the duchess. "And you know she's never said a damn word about her relationship with Charles. She's never complained."

"She's always said the family motto is 'Thou shalt not whine,' and she hasn't whined," the author added. "Oh, my god. Talk about bad press. [She's been] called everything from a 'hag' to 'horse-face' to 'a witch.' She's had the most appalling things said about her, but she never complains. Again, it's very English. She just takes it on the chin."

Prince Charles and Duchess Camilla were both married prior to their wedding in 2005. He tied the knot with Princess Diana in 1981, but the couple divorced in 1996, one year before she died in a car crash in Paris.

Camilla, meanwhile, married British Army officer Andrew Parker Bowles in 1973 and went on to have two children with him. They divorced in 1995.

In February, Queen Elizabeth II announced on the eve of the 70th anniversary of her monarchy that she wishes for Duchess Camilla to be known as queen consort when Prince Charles takes over the throne.

"When, in the fullness of time, my son Charles becomes King, I know you will give him and his wife Camilla the same support that you have given me; and it is my sincere wish that, when that time comes, Camilla will be known as Queen Consort as she continues her own loyal service," the Queen wrote in a statement.

Prince Charles responded to the Queen's comments by saying that he and Camilla "are deeply conscious of the honor represented by my mother's wish."

Following the monarch's announcement, an unnamed source told Us Weekly that Prince Charles was "over the moon" that his mother has "given her seal of approval," adding that it was "a dream come true" for the Prince of Wales.

"The Palace Papers" hit shelves Tuesday.