The Spice Girls split in 1998 after Halliwell quit the group, but they came together in 2007 for a special tour.
Last week, four members of the group, Halliwell, Emma Bunton, Melanie Chisholm and Melanie Brown, were photographed in London, prompting rumours that they might be working together again, reports Orange News.
The four singers had been in contact the entire evening with the fifth Spice Girl, Victoria Beckham, whom they reached through text messaging.
Halliwell is not completely ruling out the possibility of the group’s return. She stated, "We always talk about creative plans. Right – now, I’ll be honest: We are gathering information about a possibility, but I don’t like to… when you are evolving a plan, you don’t want to share it with the world."