Kensington Palace might be the home of the Duke and Duchess of Cambridge - but it's also a top tourist attraction.
Visitors flock to the London palace to tour its grand staterooms and see its ever-changing fascinating exhibitions.
Of course, Kate and William's private quarters of the palace within Apartment 1A are strictly off-limits to the visiting public.
But one Tik Tok user has discovered a very subtle way to ensure no visitors to the palace can even get as much as a sneak peek into their private garden - partially frosted windows.
Royal fan Laura-Ann Bar, whose Tik Tok name is @allthatspretty shared a video showing the secret windows.
She wrote: "I’m at the Kensington Palace tour!
“Look at the secret windows they have that make sure you can’t see into Kate & Will’s private garden to the right.
“They have it on all the windows in this room.”
William and Kate have only shared small glimpses inside their home at Kensington Palace in the past such as when Barack and Michelle Obama visited - although their sleeping quarters strictly off-limits.
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However, they did once give an insight into what the bedrooms of Prince George and Princess Charlotte might look like.
During a visit to Sweden's national museum of architecture and design in Stockholm in 2018, they revealed they had some Ikea furniture.
Marcus Engman, the company's head of design, said they told him that they had some of the company's furniture for Prince George and Princess Charlotte's own rooms.
However, despite it being the Cambridge's home, Kensington Palace is also home to the Duke and Duchess of Gloucester, the Duke and Duchess of Kent and Prince and Princess Michael of Kent.
Meghan Markle and Prince Harry also used to live there, in Nottingham Cottage, before moving to Windsor, and then Canada and LA.
Speaking about the Cambridge family home on True Royalty's Royal Beat, royal author Christopher Warwick said: "It has 20 rooms from the basement to the attic, it is not a small house.
"All of these royal residences at Kensington Palace are called apartments, which of course makes people immediately think they are flats like the American term for an apartment.
"They are not. If you think of Kensington Place in a way it is built around three courtyards. If you kind of think of them as being these wonderful red brick terrace houses. Because they are all joined, but separate houses."