Tess was born in the VU Amsterdam Hospital on 21 August 1991, half an hour after her twin brother Joël.
[2] At the end of the voting, Tess finished in seventh position, the country's best performance in the contest at that time.
[citation needed] After the contest, she released several additional singles, including the theme song for the children's television series Spetter, "Mijn allerbeste vriend".
Together with Thomas Berge, Gaerthé sang the Dutch version of the main duet of High School Musical 2, by Disney.
Gaerthé's first album, Onweerstaanbaar was released on 6 March 2008 in Belgium and the Netherlands and was the final step of a her earlier singing career, as she had no desire to continue to stay a child star.