Meghan Markle feels ‘sick to her stomach’ about her half-sister Samantha’s upcoming bombshell memoir, sources have claimed.

Samantha, 56, is set to release the book titled ‘The Diary of Princess Pushy’s Sister Part 1’ in the US next month, after announcing she was writing the memoir in 2016.

According to Barnes & Noble, which is set for release on February 1, the Duchess’ sister promises the 330-page tome will expose ‘hidden truths about her family, as a royal fairy tale plummets from the tea towels’.

Insiders told In Touch the Duchess of Sussex, 39, who is currently living in her $14 million Santa Barbara mansion with Prince Harry, 36, and one-year-old Archie, is upset about the book but ‘won’t act bothered in public.’

The Duchess of Sussex, 39,  feels ‘sick to her stomach’ about her half-sister Samantha’s upcoming bombshell memoir, sources have claimed

Meghan Markle’s half-sister Samantha (pictured) is set to finally release a tell-all memoir after years of touting her dysfunctional relationship with the Duchess of Sussex

The book has been published by Barnes & Noble, with the description stating: ‘Things are not always as they seem, in a world where social labels define who we are, how we live, and how we view each other.

‘Samantha Markle finds herself caught in between the cross hairs of media mayhem, when she reveals hidden truths about her family.’

It also hints that ‘things are not always as they seem’ and sometimes the ‘truth is stranger than fiction’.

Meghan is thought to have last seen her sister, who lives in Florida, in 2008 – yet Samantha has previously been highly critical in interviews about Meghan’s character.

Meghan is thought to have last seen her sister, who lives in Florida, in 2008 – yet Samantha has previously been highly critical in interviews about Meghan’s character

She has previously branded her a ‘shallow social climber’, blamed Meghan for freezing out their father and other members of the family, called her ‘inhumane’ and ‘the Duchess of Nonsense’.

In February last year it was reported that Meghan burst into tears after discovering her estranged half-sister Samantha was planning to write a book about her.

The Duchess of Sussex felt she was being ‘taken advantage of’ by her sister, according to a close friends.

Samantha first revealed her literary ambitions in April 2016 when Meghan’s romance with Prince Harry became public.

Samantha first revealed her literary ambitions in April 2016 when Meghan’s romance with Prince Harry first became public. Pictured, Prince Harry and Meghan Markle’s engagement photoshoot in 2017

She announced last year she would be writing a second book which, like the first, which will be called, ‘In the Shadows of the Duchess’.

In August last year, it was revealed Meghan was ‘furious’ with members of her family after ‘absurd claims’ were made against her as her relationship with Prince Harry heated up.

Bombshell biography Finding Freedom, by Omid Scobie and Carolyn Durand, claimed Meghan and her ‘estranged’ sibling had not seen each other in more than a decade, and had only bumped into each other twice since they were children.