Geri Halliwell says her Ugenia Lavender children's books are "a rebirth of girl power."
The books follow the adventures of nine-year-old Ugenia and her friends.
The Spice Girls singer has signed a six-book deal with publishers Macmillan.
Geri said: "I've really pulled myself into it. I actually feel like she [Ugenia] is a rebirth of girl power."
Geri Halliwell is the latest celebrity
to write children's books.
Model Katie Price released Perfect Ponies last year and Madonna has written several, including The English Roses and Mr. Peabody's Apples.
Ginger Spice also says she based one of the characters in Ugenia Lavender on fellow Spice Girl Victoria Beckham. But that character didn't make it into the final edition.
Speaking of the other characters in the book that did make it, she said: "There's a celebrity chef who's her uncle who's slightly highly strung, so you could say there's a little bit of Gordon Ramsay.
"But then you could say there's a little bit of George Michael in there.
"And Victoria [Beckham], there was a Princess Vattoria and she was in the early drafts.
"She might have a guest appearance. But she read the originals and thought it was cute. It's quite flattering isn't it?
"It's like the Simpsons, when you have a cameo. But I wanted the stories to be strong enough in themselves. They are character-led."
'Books my work'
Geri Halliwell says she started writing the children's books four years ago.
She said: "I wrote a few stories when I was out in LA and then I shelved them for a couple of years.
Geri Halliwell says she hasn't ruled out more Spice Girls gigs
"I showed them to a friend and he encouraged me to pick the idea up again and said I should show them to publishers, which I did.
"One of the publishers said, 'Look, we really love this. Can you write 18 stories, six books?'"
The first book is published on 2 May, with one new story out every month until October.
Halliwell appreciates some people might think she didn't write the books.
She said: "All I can say is, one, I love reading and I've always written the lyrics when I was in the Spice Girls.
"That's my favourite bit and coming up with concepts. I'm quite an imaginative person.
"You can only read the books and you just realise that actually that silly sense of humour could only come from me. I don't think anyone's that mad."
'No more singing'
Geri Halliwell finished the Spice Girls reunion tour in February but says she has no immediate plans to return to her solo career.
But she hasn't ruled out getting together with the Spice Girls again.
She said: "I really feel like I've done it with the singing. Right now I've got no desire to do singing. I just feel really comfortable writing and reading.
"And with the Spice Girls, what I've learnt from my past is that you can never say never. You can't shut the door on anything. I think the door is left open."