Initiated by Victoria Beckham, the auction will coincide with the launch of the Spice Girls musical, "Viva Forever!," which debuts in London's West End this December.
All proceeds from the sale of the costumes will go to the Save The Children and Children In Need charities.
"I've got all my costumes still. I can't wait for (my daughter) Harper to grow a little so she can have some," Beckham told The Mirror at the "Viva Forever!" press conference. "But the rest I'd like to put up for charity, I think it would be a fantastic thing to do."
Items up for auction will likely include an array of catsuits, tracksuits, crop tops, mini dresses and Buffalo boots. Will you be spicing up your life with some of these '90s pop star looks?