The 46-year-old earned her famous nickname thanks to her fiery locks at the height of the band's fame in the '90s. Since then, she's gone through a series of style transformations, most recently sporting a strawberry blonde hue, but has now returned to the hair colour that made her famous ahead of her return to the stage alongside bandmates Emma Bunton, Mel B (Melanie Brown) and Mel C (Melanie C) on Friday night, May 24.
Geri achieved the new look with her stylists' help and a home dye kit by L'Oreal.
In an video taken in her kitchen, Geri sat with a towel on her head before the big reveal, and said: "I haven't had ginger hair for over 20 years so I'm a bit scared. I was keen to go back to a coppery ginger shade the fans know and love."
But the mother-of-two needn't have worried, as she showed off her stunning transformation in a series of gorgeous pictures.
"Geri wanted to update her classic look with something a little more refined," a source told Britain's Daily Mirror newspaper. "It's still Ginger Spice – just grown up."
The group will be making their highly-anticipated return to the stage in Dublin, Ireland on Friday night. Preparations for the tour haven't been easy, however, with rumours of a rift between Geri and Mel B emerging after Scary Spice revealed details of a tryst she and her bandmate had enjoyed in their heyday.
However, Geri hit back at the feud claims during a recent interview with Britain's The Sun newspaper, in which she insisted critics of the band can "f**k off".
"Our relationship is really good. We've all been really positive, so it's nice. It's natural. I'm really happy, everyone's happy," she shared. "We're having a blast. It's an absolute laugh."