Princess Beatric of York to Auction Royal Wedding Hat on eBay

Chris Jackson/Getty Images

She'll donate the proceeds to UNICEF, her mom, Duchess Sarah Ferguson, announced on "Oprah" Wednesday.

Princess Beatrice is selling off her much-maligned royal wedding hat for a good cause.

"She's putting it up on eBay to auction it for UNICEF and for children in crisis," her mother, Duchess Sarah Ferguson, said Wednesday on The Oprah Winfrey Show. PHOTOS: What Kate Middleton and famous guests wore to the wedding

Beatrice's beige Philip Treacy topper was mocked in a Facebook group called Princess Beatrice's Ridiculous Royal Wedding Hat, which had more than 12,000 followers just hours after Prince William and Kate Middleton wed in London on April 29. (It now has more than 136,400.) E! targeted it in an epsidoe of Fashion Police. PHOTOS: Kate Middleton and Prince William say "I Do"

Treacy -- who designed the fascinators for 36 guests, including Victoria Beckham -- defended the look. PHOTOS: Famous royal weddings

"They trusted me to make them. Gorgeous and beautiful can be open to interpretation … I thought they looked gorgeous and beautiful. But no one is crying if anyone didn't," he said. PHOTOS: The 9 wackiest wedding celebrations