Meghan Markle is set to take part in another exclusive interview on Sunday with US radio show NPR Weekend, it will be the first time she's spoken since welcoming baby girl Lilibet.
Meghan and husband Prince Harry's interview with Oprah Winfrey in March saw the pair make a number of damning allegations against the royal family.
Harry then opened up further after appearing on Dax Shepard's podcast Armchair Expert and in his mental health docuseries with Oprah Winfrey.
The pair then welcomed their daughter and named her after the Queen, whose nickname among the family is Lilibet - something the monarch came up with on her own after struggling to say Elizabeth as a child.
Meghan's new interview is set to take place on the eve of Prince William's 39th birthday.
Royal commentator Richard Fitzwilliams told Express.co.uk, "There was controversy over the Sussexes use of the Queen’s intimate nickname Lilibet for their daughter very recently.
"In past months their revelations in interviews, especially in that with Oprah, have caused a crisis for the Royal Family."
He claimed the royal family will likely be hoping she doesn't raise "contentious issues".
"We don’t know if Meghan will refer to her period as a working royal or to contentious issues on Sunday, but it is to be hoped she will not mention matters of dispute."
Richard added that if the rift was to heal, Meghan and Harry will need to avoid clashing with important dates in the royal calendar.
"If and when it heals, it would also be helpful if diary clashes could be kept to a minimum, so special occasions, both public and private, can be used beneficially by all of the royals."
Meghan's book was inspired by Harry's relationship with their son Archie.
The Duchess shared a statement about the book on the couple's official Archewell website, saying, "While this poem began as a love letter to my husband and son, I’m encouraged to see that its universal themes of love, representation, and inclusivity are resonating with communities everywhere.
"In many ways, pursuing a more compassionate and equitable world begins with these core values.
"Equally, to depict another side of masculinity — one grounded in connection, emotion, and softness — is to model a world that so many would like to see for their sons and daughters alike. Thank you for supporting me in this special project."
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