Lady Gabriella Windsor says she feared her tiara would come “crashing down” on her wedding day.
Known as Ella, the minor royal wed financier Thomas Kingston at St George’s Chapel, Windsor Castle, in May.
The Duke of Edinburgh, the Queen and the Duke of Sussex were all at the ceremony.
Speaking about walking down the aisle, Lady Gabriella told Hello! magazine: “Suddenly I could feel my tiara start to pull back and in those few unnerving moments I thought it would come crashing down with an almighty clunk.
“My little bridesmaids had accidentally wandered on to my very sheer tulle 20ft veil.
“I slowed down until they’d stepped off it, but then it happened again. Fortunately my hairdresser had pinned the tiara in place and it stood firm.”
Seeing her Luisa Beccaria gown again, she said of the wedding: “It was a magical day and Luisa created a wonderful dress for me.”
The daughter of Prince Michael of Kent added: “This is the first time I’ve seen it since the wedding and it brings back so many happy memories.”
She also said she thiinks both Eugenie, who married Jack Brooksbank in October, and the Duchess of Sussex - who was known as Meghan Markle when she married Prince Harry there in May 2018 - chose "special" gowns for their nuptials.
"The dresses they both wore were very special," she said.
"Meghan's was incredibly elegant and she looked so beautiful and serene. Eugenie's was very feminine and showed off her tiny waist.
"She looked stunning. It was interesting and bold of her not to wear a veil so that she could show her scar; a brave statement of support to fellow sufferers and she did it in a striking way."
Gabriella, who is known is Ella, wore a custom lace gown by Luisa Beccaria for her wedding and felt "lucky" that the Italian couturier - who is friends with her parents Prince and Princess Michael of Kent - agreed to design her gown.
She said: "My wedding day felt magical and Luisa created a wonderful dress for me...
"I was so lucky to have Luisa design my dress. When it comes to design, she's a genius."
And Ella admitted it was a "privilege" to marry at Windsor Castle.
She said: "It's a very special place to me.
"I have wonderful memories of Christmases there as a child and horse riding on the estate.
"I was also bridesmaid for my cousin, Lady Helen Taylor, at the chapel. Her 14-year-old daughter Estella was one of my special attendants on my wedding day."
The full interview is in Hello! magazine, out now.