The 1981 wedding of Princess Diana and Prince Charles was a major event, and the photos have become iconic.
And a collection of behind-the-scenes photos was recently made public for the first time by an assistant to photographer Lord Patrick Lichfield.
"These candid never-before-seen photos capture precious informal moments of the royal family," Bobby Livingston, executive VP at RR Auction, told BuzzFeed Life.
A few of the photos show Princess Diana with 5-year-old Clementine Hambro, the youngest of her bridesmaids.
(The TV monitor showed the family the crowds outside Buckingham Palace.)
This one shows the royals just chillin' like you do at a family wedding.
According to a press release from RR Auction, Lichfield's "peerage descent allowed him unparalleled access to the royal family."
In a letter that accompanies the photos, Lichfield's assistant wrote that they were assigned by the royal couple to take photos of the family and their guests in between the ceremony and the reception.
"These are photographs that were not used in the family album that Lord Lichfield presented to Prince Charles and Princess Diana to commemorate the day of their wedding," he wrote.
"The royal wedding was seen by an estimated 750 million viewers on television; it's something that most of us baby boomers can relate to," Livingston said.
Livingston said RR Auction expects the photos to sell for $1,000–$2,000 and that's a "conservative estimate."
The final shot shows Princess Diana and Prince Charles from behind the famed balcony.
