McClarnon co-wrote several Atomic Kitten songs, including the UK top 10 hits "See Ya", "I Want Your Love" and "Someone Like Me".

In 1997, while McClarnon was still in secondary school, her music teacher arranged for her to take part in an audition with OMD frontman Andy McCluskey, who was aiming to create a new girl group.

[4] On 27 December 2006 McClarnon appeared in the ITV documentary The Girl With the Golden Hair and performed three songs with Richard O’Brien: "Thank You for the Music", "I Wonder (Departure)" and "I’m a Marionette".

[5] In March 2007, McClarnon recorded "(Don't It Make You) Happy" to compete for the UK in the Eurovision Song Contest 2007, but failed – the competition was won by Scooch.

Despite the success of the first single, McClarnon's album release was delayed several times for 3 years, until it was canceled when she left the label in 2008.

[10] On 31 January 2013 the original line-up of Atomic Kitten – McClarnon, Hamilton and Katona – would reform for The Big Reunion, along with five other pop groups of their time – 911, Honeyz, B*Witched, Five and Liberty X.