Kimberley grew up with two sisters and one brother. She got her first taste of fame starring on an advert as a child. As she grew older she appeared in the 2000 television series This Is Personal: The Hunt for the Yorkshire Ripper as Gillian Oldfield, and she played Tracy in Dream Back in 2001.

In 2002, Walsh auditioned for a reality TV show dedicated to assembling a new girl group - Popstars: The Rivals. She and future bandmate Nicola Roberts did not originally make the final ten, but Walsh brought back to the competition when original finalist Hazel was found to be over the age limit. Walsh became the fourth girl to be voted into Girls Aloud, much to the delight of her friend and new bandmate, Nadine Coyle. They had become good friends during the course of the show.

While in Girls Aloud, Walsh has been popular among the band's male fan base. In April 2004, Heat magazine named her toned tummy as the 5th best in the world, ahead of superstar Beyonce and singer Rachel Stevens.

--Wikipedia