Girl Power! Geri Halliwell wears a Union Jack dress on stage with the Spice Girls at the 1997 BRITs This image appears in the gallery:The Most Iconic Pictures Of The 90s 2. Girl Power! Geri Halliwell wears a Union Jack dress on stage with the Spice Girls at the 1997 BRITs 26 images See the full gallery: The Most Iconic Pictures Of The 90s