Queen Camilla has met JK Rowling at the Palace of Holyroodhouse, where the pair explored their "shared passion for books".
The Royal Family Instagram account posted a photo of the Queen, wearing a deep blue dress, standing next to the world-famous Harry Potter author.
"With a shared passion for books and a deep commitment to children reading for pleasure, The Queen and author J.K. Rowling have met at the Palace of Holyroodhouse in Edinburgh," the caption read.
"Her Majesty and Ms Rowling discussed the importance of ensuring that young people have access to books and the vital part reading plays in opening doors for future generations."
Both Ms Rowling and the Queen are vocal supporters of victims of domestic and sexual violence and abuse.
But the endorsement has been met with sharp criticism online, with some branding Ms Rowling "Queen of the transphobes".
Meanwhile, another commented: "This post, in JUNE, while it’s still Pride Month. Really ?!"
Ms Rowling has long championed women's spaces, and has been quick to criticise institutions for failing to introduce single-sex areas.
Earlier this month, she slammed retailer H&M over its use of mixed-sex changing rooms when a man allegedly filmed a mother and daughter as they dressed.
"One of those things that never happens if you open up women’s changing rooms to any man who wants to come inside has happened. Again," she said.
A 47-year-old man was arrested on suspicion of voyeurism after he had been confronted by shoppers in Bournemouth.
A spokesman for the force said: "This remains an active investigation and we would urge members of the public to refrain from speculation and the sharing of images relating to this matter online or via social media."
Ms Rowling was praised for her words by campaign group Women of Dorset, who said the author is "100 per cent right".
She has also been critical of the use of hormones and medicine to transition children.
In February this year, Ms Rowling accused doctors involved in those practices as "barbarous activists", describing youth gender medicine as "one of the worst medical scandals of all time".
She made the remarks in response to a US medical malpractice case involving Fox Varian, a young detransitioner who has reportedly been awarded $2million (£1.45million) in damages after suing the psychologist and surgeon who approved her for a double mastectomy at the age of 16.
With the Royal Family often choosing to send messages through images, the snapshot of the Queen next to Ms Rowling sends a powerful statement.
Buckingham Palace declined to comment on any further details, and insisted their shared passion for literature is what was discussed.
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