The trio of singers enjoyed a girls' night Friday and shared clips from the get-together on Instagram.
"Hanging with my girls yipppppeeee #girlpower #wichesofeastwick @emmaleebunton @therealgerihalliwell," Mel B captioned a gif.
"On a Friday night all you need is tea, cake, wine and friendship! #girlpower," Bunton added to a clip on her own account.
The mini-reunion follows months of speculation about a 20th anniversary celebration. Mel B, Bunton and Halliwell had teased a reunion in July that would mark the 20th anniversary of the Spice Girls' debut album Spice.
"We have the best fans in the whole entire world. You've stood by us for twenty years and we want to say a big thank you. We've had our ups and downs, but you've always been there," the trio said at the time.
"We want to celebrate and have a party. And when we do, you're all invited!" they revealed. "Happy 20th birthday to all our fans. We hope to tell you you soon what you want, what you really really want..."
Mel B, Bunton and Halliwell previously got together in May to record new music in London. Spice Girls members Victoria Beckham and Mel C have kept quiet about their potential involvement with a reunion.