Revelation that Meghan Markle felt "unprotected" by the British royal family while she was pregnant would have a huge impact on her husband's relationship with Queen Elizabeth, local media reported.
Kensington Palace declined to comment when contacted by Insider.
The Duchess said that "several member [s] of the Royal Family do "undertake paid work" including, for example, Princess Beatrice of York, Princess Eugenie of York and Prince Michael of Kent".
"The Claimant had become the subject of a large number of false and damaging articles by the United Kingdom tabloid media, specifically by the Defendant, which caused tremendous emotional distress and damage to her mental health", a legal spokesperson for the duchess said in the document, obtained by Insider.
To top things off, Meghan also claimed that her 2018 royal wedding to Prince Harry brought in a whopping £1billion in tourism cash that "far outweighed" taxpayers' contributions towards security.
The "institution" of the monarchy failed to protect her from the accusations and she was "prohibited from defending herself", they added. The annual service organised by the Royal Commonwealth Society, is the largest annual inter-faith gathering in the United Kingdom.
"Any public costs incurred for the wedding were exclusively for security and crowd control to protect members of the public, as deemed necessary by Thames Valley Police and the Metropolitan Police", a submission from her legal team says.
The tabloids have accused the duchess of "invading her own privacy" - but Markle denies knowing about her friend's interview with People.
The Mail justified publishing the letter by saying five unnamed friends of Meghan, who gave birth to Archie in May 2019, had put her version of events in interviews with the US magazine People.