A bizarre headpiece worn by Princess Beatrice at the wedding of Prince William and Kate Middleton is to be auctioned on eBay, her mother said.
Sarah Ferguson told US talk show host Oprah Winfrey that her daughter's opinion-dividing Philip Treacy creation would be sold on the website for charity.
Kicking off the televised interview, the Duchess of York said: "Well, firstly, Beatrice wants to give you lots of love, and Eugenie, and say that she's eBaying her hat."
After Winfrey acknowledged there had been "a bit of a hat controversy", Sarah added: "Yes, so Beatrice said to tell you that she's putting it on eBay to auction it for Unicef and for Children in Crisis."
The flamboyant creation made headlines and sparked pages on Facebook, which have attracted thousands of fans.
Mocked-up pictures on the internet have seen the headgear compared to everything from a lavatory seat to a cat flap.
But in a recent interview with Grazia magazine, the 22-year-old said it was "wonderful that it's had such a reaction". She added: "It's an incredible response to a hat, really. I'm glad it provoked so much conversation."
In the interview, broadcast in the US on Wednesday, Sarah admitted she found it "so difficult" not to have been invited to the royal wedding on April 29.
Sarah, who was filmed offering an undercover reporter access to the Duke of York for £500,000 last year, said she did not feel ostracised by the lack of an invitation.
She added: "I felt that I ostracised myself by my behaviour, by the past, by living with all the regrets of my mistakes, that I sort of wore a hair shirt and beat myself up most of the day thinking and regretting: why did I make such a mistake? Why have I made so many mistakes? So I did spend a good three hours on that."