The 41-year-old singer - who starred in the group alongside Mel B, Emma Bunton, Geri Halliwell and Victoria Beckham - said they have staged talks about a possible comeback and she's even identified Hyde Park as the ideal venue, reported Daily Mirror.
"We've talked about it, but we just haven't got our act together. We're a bit useless. But performing at Hyde Park would be amazing.
"I went to see Taylor Swift there this year and it was so wonderful. It was a really good, fun gig. I think for the Spice Girls that would be appropriate. It's a bit more friendly," she said.
"There's definitely no chance we'll get our act together by then. It's a shame, actually. We need to stop procrastinating and get on with something.