Princess Beatrice is said to have given Prince Harry and Meghan Markle, Duchess of Sussex permission to film at the Queen's private cottage.
The Princess's cousin recently released his self-titled Netflix documentary, Harry & Meghan, which included footage of the couple filmed inside their late grandmother's outsize Wendy house at Windsor Castle.
Princess Beatrice, 34, was gifted custodianship of the historical house by Her Majesty in 2010, overseeing renovations.
The Daily Mail reports she is "understood to have given [the Suessexes] the nod to bring cameras inside."
However the date of this filming is not known. OK! has contacted Princess Beatrice's rep for comment.
Queen Elizabeth II was gifted the home – known as Y Bwthyn – by the people of Wales when she was six years old in 1932.
The people of Wales wanted to reflect love by gifting the young princess the cottage. As her uncle King Edward VIII was the King at the time, it was not known that she was destined to one day become Queen.
Queen Elizabeth and her sister Princess Margaret are said to have loved the cottage, which has five feet high rooms and was designed by architect Edmund Willmott, during their childhoods.
When the Queen was gifted the home, it was fully furnished with running water and electric lighting.
Known for her privacy, Her Majesty's beloved cottage is located away from the eyes of the public, on the Windsor Royal Lodge's garden.
In 2012, Princess Beatrice invited cameras into the cottage for The Diamond Queen BBC series, the first time the 24 feet long and eight feet deep home was captured on camera.
Princess Beatrice described the home as "the most glamorous Wendy house ever".
The renovations, which the Queen's granddaughter oversaw included rewiring, new curtains being put in place and refreshed paint work.
Green sofa coverings were also put in place, replacing the cottage's former blue colour scheme.
Princess Beatrice's father Prince Andrew, who has lived in Royal Lodge since 2004, is believed to have paid for the renovations of the home.
Prince Harry and Meghan's documentary saw the two speak about public scrutiny, their journeys as senior members of the royal family, and their love story.
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