LONDON, ENGLAND - DECEMBER 11:  (EMBARGOED FOR PUBLICATION IN UK TABLOID NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME. MANDATORY CREDIT PHOTO BY DAVE M. BENETT/GETTY IMAGES REQUIRED)  (L to R) Geri Halliwell, Melanie Brown, Melanie Chisholm and Emma Bunton pose backstage at the Gala Press Night performance of 'Viva Forever' at the Piccadilly Theatre on December 11, 2012 in London, England.  (Photo by Dave M. Benett/Getty Images)