Geri Halliwell-Horner tells PEOPLE that while at her 17-year-old daughter's school, she noticed that her classmates were all dressing in 1990s fashions.

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Geri Halliwell Reveals Why She Ditched Her Eccentric Spice Girl Style

Geri Halliwell Reveals Why She Ditched Her Eccentric Spice Girl Style

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Geri Halliwell-Horner on the Return of '90s Fashion (Exclusive)