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"It's a brilliant musical," says Bunton, aka Baby Spice, in the video below, praising "Viva Forever" for its strong story and focus on motherhood.
"I think the musical is testimony 'Girl Power' has longevity," said Halliwell, aka Ginger Spice, referencing the pop quintet's '90s-era female-empowerment slogan. "Who would have thought 16 years later our songs and the message of that is still standing and still carries on, just in a different way?"
"Viva Forever" opens Dec. 11 on London's West End.
Watch Spice Girls' 'Viva Forever' Video