Princess Kate is "braced" for her sister-in-law Meghan Markle launching a bombshell royal book, a source has claimed.
Royal author Tom Bower has predicted the 42-year-old will pen her own autobiography and it will be a "huge money-spinner."
Fellow royal author Angela Levin has claimed the Duchess of Sussex's would-be memoir would be "more powerful" than Prince Harry's own book, Spare, as it would include lots of "moans and groans about how badly she was treated as a royal".
Royal commentator Phil Dampier suggested it will be the Princess of Wales who will be targeted the most in the potential book.
WATCH NOW: Commentators discuss Harry and Meghan
He said: "Harry’s Spare was a best seller and Meghan's would probably sell even more.
"It would also be the ideal opportunity for Meghan to put across her view of what happened to her when she met Harry, fell in love, joined the most famous family in the world and then left.
"She would give her side of what really happened between her and Kate in the run-up to the wedding when each allegedly made the other cry."
The commentator also told The Sun: "Everyone will be fascinated to hear Meghan’s take on her relationship with Kate, whether she was hostile or welcomed her from the start.
Prince Harry has already released his own memoir
PA
"She probably thought she should have got equal billing and didn’t seem to appreciate from the start that she and Harry were the B team, not on the same level as William and Kate.
"She will probably talk about comparisons that were made in the press between them and will come across as bitter."
Dampier continued: "The royals will assume the worst and brace themselves for more revelations.
"It would only make the relations much worse, but I still don’t think the royals will hit back.
The Waleses and the Sussexes are embroiled in a bitter feud
PA
"They will stay quiet and soak it up, even though they will be deeply hurt by it.
"Their policy was for Harry and Meghan to run out of ammunition, but unfortunately they have plenty left in the form of a Meghan book.
"There is nothing she won't twist to justify her position."
LATEST ROYAL NEWS:
Prince William and Princess Kate could be attacked in Meghan's would-be memoir
PA
Dampier claimed: "It really would be the last straw and I doubt William and Kate would ever talk to Harry again.
"I doubt she will directly criticise the late Queen as she knows how unpopular that will be.
"But she could reveal private conversations and that would be very troubling for the King, the Queen and the Prince and Princess of Wales."