Their singles "I'll Stand by You", "Walk This Way", and "The Promise" have charted at number one.Two of their albums have reached the top of the UK Albums Chart: their greatest hits album The Sound of Girls Aloud and 2008's Out of Control, both of which entered the chart at number one, with over one million copies of the former being sold.
In 2009, Girls Aloud won "Best Single" with their song "The Promise". In 2011, Harding entered a rehab facility for depression, alcohol addiction, and prescription drug abuse.
During the group's break, Harding turned her attentions to acting, appearing in Bad Day, the BBC television film Freefall, Run for Your Wife, and St. Harding contributed three solo songs to the soundtrack of St. In late 2012, Harding reunited with Girls Aloud to celebrate their tenth anniversary together.
They also achieved seven certified albums and have been nominated for five Brit Awards, winning the 2009 Best Single for "The Promise".
The group's musical style is pop, but throughout their career they had experimented with electropop and dance-pop.
She auditioned both for being a contestant on UK talent-search shows Fame Academy and Popstars: The Rivals and it was in the latter where she found fame, pulling out of Fame Academy after being accepted into the first sound of Popstars.
Harding also entered FHM's High Street Honeys 2002, the magazine's national beauty contest.
On 19 August, it was reported that Harding's debut album would be released in the fourth quarter of 2013.
In November 2013, Harding spoke to Daily Mail, hinting at the possible release of her debut solo album sometime in 2014.
Several thousand applicants attended auditions across the UK in hope of being selected.