X Factor star Diana Vickers hit the charts with her debut single

"Once" is a song by British singer Diana Vickers, written by Cathy Dennis, Eg White and Vickers for Vickers' debut studio album Songs from the Tainted Cherry Tree. "Once" was released as the album's lead single in the UK on the 19th April."Once" was premiered on BBC Radio 1's Switch show on 31 January 2010, and its video premiered on 3 March 2010 on Play.com.
The song has been A-listed on MTV and Radio 1's playlist. On 18 April 2010, less than 24 hours after release, it reached number-one on the UK iTunes store.