Girls Aloud set to perform at a festival to mark the 2012 Olympic Games in London

Girls Aloud are set to perform at a music festival being held to mark the 2012 Olympic Games in London.The group - which is comprised of Cheryl Cole, Nadine Coyle, Kimberley Walsh, Nicola Roberts and Sarah Harding - are reforming after a self-imposed break to mark their 10-year anniversary and are in talks to be on the bill at a special event being held at London's The O2.Other acts being