Beckham. 40, decided to help donate money and raise awareness for mothers2mothers, a nonprofit organisation devoted to helping mothers living with HIV, reported E!Online.
"I laughed a lot when we were going through my wardrobe, as the pieces hold so many happy memories for me, David and the children," said Beckham.
"A lot of the clothes have been specially designed for me by the most talented designers, and I've loved wearing them," Beckham added.
The sale will include outfits the former singer has worn to red carpet events, as well as select pieces from her Spice Girls days.