Princess Diana
Princess Diana's unauthorized author is setting her sights on Meghan Markle. Pictured: Princess Diana is seen during the official Madame Tussauds' wax effigy of HRH Prince William is unveiled at London's Marylebone Road tourist attraction on August 3, 2005 in London, England. Getty Images/MJ Kim

Princess Diana biography author Lady Colin Campbell, who exposed details about the Princess of Wales’ life, may also do the same to Meghan Markle.

While speaking with Daily Mail, Campbell said that she is currently writing a new book about the Duchess of Sussex. However, she refused to share details about her latest project.

“The thing about Meghan Markle is that it is a developing story. There is a lot more about her to come out yet,” she said.

Campbell is the author of “Diana in Private,” the unauthorized book that revealed Princess Diana’s battle with bulimia, as well as her love affair with James Hewitt. Years after releasing her book, Princess Diana confirmed that she struggled with bulimia in Andrew Morton’s book “Diana: Her True Story.”

The author, who was previously married to Lord Colin Campbell, has also forged a close friendship with Markle’s nephew, Tyler Dooley, who appeared in MTV UK’s “The Royal World.” Campbell also appeared in the same reality TV show.

“We met through my sons and the MTV show ‘The Royal World’ and hit it off straight away. He’s a very nice boy,” she gushed.

Campbell said that she has spoken with Dooley about the Duchess of Sussex, and he doesn’t have any plans to trash her. But Campbell is confident that there is still an interesting story to be told about the Markles.

“I have got my sources, but through Tyler, I found out that the dynamics of the Markle family are absolutely fascinating. Yes, far more than what’s been revealed so far,” she said.

Prior to announcing her upcoming book, Campbell also made headlines weeks ago for blasting Prince Harry’s wife over her ongoing feud with her dad and half-siblings. During her appearance on “Good Morning Britain,” Campbell said that the way that Markle has been treating her family was appalling.

“I hope for her sake and for the sake of the monarchy, as well as for the sake of both sides of her family, that she begins to embrace them,” she said.

Campbell also weighed in on Markle’s baby and said that the Duchess’ offspring won’t be black.