Including a behind-the-scenes shot of the couple on the famous balcony.
The 1981 wedding of Princess Diana and Prince Charles was a major event, and the photos have become iconic.
Terry Fincher / Princess Diana Archive / Getty Images
And a collection of behind-the-scenes photos was recently made public for the first time by an assistant to photographer Lord Patrick Lichfield.
Boston-based RR Auction will feature the 12 photos in a live auction on September 24 in Cambridge, Massachusetts.
Lord Patrick Lichfield / Via rrauction.com
"These candid never-before-seen photos capture precious informal moments of the royal family," Bobby Livingston, executive VP at RR Auction, told BuzzFeed Life.
Lord Patrick Lichfield / Via rrauction.com
A few of the photos show Princess Diana with 5-year-old Clementine Hambro, the youngest of her bridesmaids.
Lord Patrick Lichfield / Via rrauction.com
