Geraldine Estelle Horner (née Halliwell; born 6 August 1972) is an English singer, songwriter, author and actress. She rose to prominence in the 1990s as Ginger Spice, a member of the girl group the Spice Girls. With over 100 million records sold worldwide, the Spice Girls are the best-selling female group of all time. Their slogan "girl power" was most closely associated with Halliwell,and her Union Jack dress from the 1997 Brit Awards also became an enduring symbol.Halliwell left the Spice Girls in 1998, citing exhaustion and creative differences, but rejoined when they reunited in 2007.