She was crowned Miss UK in 1988, giving her the right to compete in the 1988 Miss World pageant where she placed 2nd runner-up. After moving to London, she began to write music professionally and was signed on to Warner Records.
In 2000, she co-wrote "Black Coffee". The song was recorded by All Saints and became a worldwide hit. It was number one in the UK chart, reached the Top 10 in seven other countries and featured in various international charts for 20 weeks.
Universal Music liked the songs and decided to sign her. The first single, "Don’t Say", was released digitally through online stores on 9 December 2009. Her debut album Elusive was published on 15 January 2010, entering the Swiss charts in the 20th position.
Throughout 2010, Bertarelli published two more singles in Switzerland ("Elusive" and "More Than Anything"). She also had several live performances, including the Montreux Jazz Festival and opening acts for Simply Red in Edinburgh and Zürich.
2011 also saw the release of her single "Set Your Body Free" which included remixes from Loverush UK!, Jason van Wyk, Full Intention and Nova.
In February 2012, her acoustic album Green was released digitally on iTunes worldwide. Continuing her support for the WWF, proceeds from the album are being donated to the WWF.
Born in the United Kingdom, Kirsty spent her childhood in Stone in Staffordshire. Her family owns one of the world’s major manufacturers of ceramic products, Churchill China.