Mel B said all five members of the Spice Girls are ''super excited'' about the announced musical about their career.
The Spice Girls were inspired by 'Mamma Mia!' to make a musical about their careers.
Mel B says she and her fellow bandmates - Victoria Beckham, Emma Bunton, Melanie Chisholm and Geri Halliwell - were keen to see their lives turned into a stage show similar to the hit production based on the songs of Abba.
She said: "All five of us are really super excited. We don't do anything unless all five agree.
"All of us loved 'Mamma Mia!'. We needed someone who would have a great vision alongside ours."
However, 34-year-old Mel - full name Melanie Brown - confirmed the musical will not just be a story about the girl group and will contain new elements too.
She revealed: "It's going to be fictional, but various characters will have traits that remind you of the group."
Discussing how the idea for a Spice Girls musical came about, Mel said she and her bandmates all got together before Christmas to discuss potential projects.
She told Britain's Hello! magazine: "We all just got talking. Lots of ideas were passed around and then one of the things that stuck was the musical.
"That night we celebrated the fact that we all had this amazing idea."
The West End show which will be created by the producer of the 'Mamma Mia!', Judy Cramer.