Sarah Ferguson could get revenge on King Charles by spilling Princess Diana's secrets?

King Charles has been issued a strong warning that Sarah Ferguson and Andrew could get revenge on the monarch by spilling Princess Diana's secrets.

According to a report by the Radar Online, Andrew and his ex-wife Sarah are said to be considering selling the secrets of King Charles former wife late Princess Diana to exact their revenge on the monarch and address their mounting money woes.

The close confidant tells the outlet, the former couple knew where “all the bodies are buried, so to speak.”

Following removal of their titles and eviction from Royal Lodge, the sources have claimed that Sarah and Andrew are hungry for a solid payday.

They are expected to follow Prince Harry’s footsteps, who pocketed the estimated $20million advance for his palace-bashing tell-all memoir Spare.

The insider said, "Charles took a big risk banishing Andrew and Fergie out of Royal Lodge and stripping them of their titles, because now they have nothing to lose – especially Fergie.”

“They both have seen how lucrative a book deal was for Harry, so the idea of getting one themselves could be very attractive to them right now," the source suggested.

"The money isn't exactly pouring in. Some publishers, in particular, may want Andrew and/or Fergie to reveal Diana's secrets. The public would just eat that up. Fergie and Diana were very close. There's no telling what she knows."