Formed in 1994, the group originally consisted of Melanie Brown, Melanie Chisholm, Bunton, Geri Halliwell and Beckham.
Bunton, 40, has revealed that she recently spoke to the fashion designer at her husband, David's 40th birthday party where she showed interest for the reunion, reported Contactmusic.
"Victoria is prone to changing her mind and may even decide to come on board after all.
"For a long time she has wished us the best. I was talking to her at David's birthday party and he said 'you've got to do something'. Maybe she will change her mind, she does that, who knows," Bunton said.