He replied: “Firmly on the fence. It is a difficult one because I haven’t read Meghan’s book so it could be amazing. It could be fantastic. So, I can’t judge.
“I echo Mimi and I wish [Meghan] the best.”
Olaf added: “It can be disheartening because it’s such a tough area to break into.”
Their comments come after Meghan announced the release of her new book The Bench, which is set to be released next month.
In a statement, the Duchess said: “The Bench started as a poem I wrote for my husband on Father’s Day, the month after Archie was born. That poem became this story.
She added: “My hope is that The Bench resonates with every family, no matter the makeup, as much as it does with mine.”