Meghan Markle has been branded “Duchess Difficult” by staff amid claims she “terrifies” and “belittles” people around her, according to reports.
A source close to the couple told the Hollywood Reporter: "Meghan belittles people, she doesn't take advice."
They described the Sussexes as "both poor decision-makers" who "change their minds frequently".
Harry was called "a very, very charming person" but "very much an enabler".
The report alleges Meghan is "absolutely relentless" and "marches around like a dictator in high heels".
One source claimed: "I've watched her reduce grown men to tears".
These claims come as Harry prepares to turn 40 on Sunday.
Sources suggest the Duke is feeling lonely in the US, with his security guard now his closest friend.
The report investigates the high turnover of Sussex staff, including chief of staff Josh Kettler who quit in August after just three months.
Meghan's "noisy tantrums" and "angry 5am emails" have reportedly contributed to her nickname.
The couple have not yet responded to these allegations.
The latest allegations follow earlier accusations of bullying at Kensington Palace.
Before moving to California, Meghan faced claims of 'belittling' behaviour towards two personal assistants.
Palace staff reportedly felt “traumatised”, with some comparing their experience to post-traumatic stress.
These claims prompted a royal inquiry, though details were never made public.
Meghan's lawyers strongly denied the allegations, calling them a "calculated smear campaign".
The Sussexes' PR troubles continue with recent staff departures.
Christine Weir Schirmer, their communications head, left quietly at the end of last year.
This follows Josh Kettler's resignation as chief of staff after just three months.
People magazine reported Kettler's departure as a "mutual" decision, citing it "wasn't the right fit".
These exits add to the growing list of staff turnover since the couple's move to the US.
The Sussexes have not commented on the recent staff changes or new allegations.