ROYAL aides are braced for Meghan Markle to brutally expose her rift with Kate in her explosive interview tonight.
They fear new disclosures will also deepen tensions between Prince Harry and William.
Read our Meghan and Harry live blog for the latest news...
A source said: “This is Meghan’s nuclear option.” She will also be quizzed by Oprah Winfrey about the breakdown of her relationship with her father Thomas Markle.
A global TV audience of hundreds of millions in 68 countries is expected to watch the two-hour interview, initially broadcast in the US at 1am UK time. ITV will show it tomorrow at 9pm.
Meghan’s fraught relationship with Kate is set to be covered. They had a reported bust-up over a wedding dress fitting.
The source said: “If she has chosen to speak candidly about her time with Kate then the damage that could be done to the monarchy is vast.
“She has the power to lay bare just how bad things really were between her, Harry, William and Kate.”
Broadcaster CBS has also bought extensive footage of her dad Thomas from ITV.
A source said: “Oprah is likely to show Meghan clips of things Thomas has said — and then ask for her response. It should lead to some dramatic moments.
“Meghan — and Harry — have never publicly addressed what’s gone on with him.”
Last night the Sunday Times reported up to 12 ex-aides are “queueing up” to register complaints about the Duchess of Sussex.
Buckingham Palace is investigating claims Meghan was an “outrageous bully” to her staff before she departed Britain last year.
Concerns were reportedly raised shortly after her engagement to Harry.
We can also reveal how bust-ups with aides in Australia in 2018 are to be part of the upcoming probe.
At one point Meghan is said to have lost her temper with an assistant and a hot drink was thrown.
The Duke and Duchess deny bullying and no formal complaints were lodged.
A senior source said: “She wanted to be ‘A’ list. The Royal Family is beyond ‘A’ list — but she wanted it the Beyonce way.”
The crisis comes as Prince Philip, 99, spent his 19th night in hospital after undergoing heart surgery.