Buckingham Palace is preparing to unveil previously unseen photos of the royal family in a new exhibition at the King's Gallery.
The display will trace the evolution of royal portrait photography over the last 100 years.
The exhibition begins with a 1923 engagement portrait of Prince Albert and Lady Elizabeth Bowes-Lyon, who later became King George VI and Queen Elizabeth.
Here's a look at some of the unseen images.
How many photos will be on display?
The exhibition will bring together more than 150 items by 40 photographers from the Royal Collection and Royal Archives.
Exhibition curator Alessandro Nasini said the display tells the royal family's story over the past century.
"We have analogue technology on one side, digital technology (on the other), monochrome, colour and a private commission and the official," Mr Nasini said.
"I think it gives the range … of the exhibition which goes from the very private to the very public, to the official."
Asked about his favourite shot in the collection, Mr Nasini pointed to a 1968 portrait of the late Queen Elizabeth II taken by Cecil Beaton.
The photo shows the former monarch wearing a simple black cape against a stark white backdrop.
He said it "shows the queen, perhaps more as a woman, as the person who came up behind the monarchy".
Princess Catherine's milestone birthday
Princess Kate's 40th birthday portrait will be on display.
It will hang near an 1864 portrait of Alexandra, Princess of Wales, that it is said to resemble.
The wedding of the Prince and Princess of Wales in 2011 will also be included.
It shows Prince William and Princess Kate sitting in the throne room at Buckingham Palace after their ceremony.
They are surrounded by their young bridesmaids and page boys, who had to be bribed with jelly beans by photographer Hugo Burnand to capture the image.
It's important to note that this photo has already been released by the royal family — it is not an unseen photograph. However, it will be on display for the first time.
A look back in time
One never-before-seen image from 1964 shows four royal mothers, Queen Elizabeth II, Princess Margaret, Princess Alexandra and the Duchess of Kent, all holding their newborns.
The picture was taken as a thank you to royal obstetrician Sir John Peel, who delivered all four babies within two months.
Accompanying the image will be a handwritten letter from Princess Margaret to her sister, "Darling Lilibet", asking her to sign the print for them to gift to the doctor.
Other unreleased images in the collection include one from 1943 in which King George VI sits at a desk in the Royal Lodge at Windsor Castle, surrounded by his family.
Taken by Beaton, the image's purpose was to evoke "a sense of stability and hope for the nation" during World War II.
Coronation portraits
The exhibition also displays many iconic photos of Queen Elizabeth II, including her coronation portrait by Beaton.
The black-and-white photo shows the queen in full regalia in the Green Drawing Room at Buckingham Palace, in front of a painted backdrop of Westminster Abbey.
King Charles III's official coronation portrait in 2023 will also feature.
The Royal Collection Trust said that the vintage images cannot be on permanent display for conservation purposes.
The exhibition will run from May 17 until October 6.
ABC with wires