The 1994 pop girl group comprise Bunton, Melanie Brown, Melanie Chisholm, Geri Halliwell and Victoria Beckham.
Bunton, 39, revealed she recently met up with Halliwell and Mel B, reported Now magazine.
"We love each other and we love performing together. It's just when the timing is right because we all have our own careers now and we have families, it's just about getting five schedules together and that's all it is," she said.