[4] Blanche previously competed on season five of The Voice Belgique, where she was a member of Team Cats on Trees.

[11] In January 2016, Blanche auditioned for season five of The Voice Belgique performing Adele's "Daydreamer", with two of four coaches turning for her.

[citation needed] On 22 November 2016, broadcaster Radio Télévision Belge de la Communauté Française (RTBF) announced that they had internally selected Blanche to represent Belgium in the Eurovision Song Contest 2017 in Kyiv, Ukraine.

"City Lights" was accused of plagiarising the song "Eclats" from Canadian singer Alexe Gaudreault,[14] but Pierre Dumoulin, the author of the song, denied these claims: "It is obvious that there are similarities in the melody as can be found in a hundred or even a thousand current melodies.

[20] In August 2018, "City Lights" was certified double platinum in Belgium, for sales exceeding 40,000 copies.

[21] "City Lights" also charted across Europe, including in France, Germany, Spain and Sweden.

[20] Since Eurovision, Blanche has won a 2018 European Border Breakers Award, which recognizes emerging artists that have achieved success outside their home country.

[32] The song spent 14 weeks in the top 50 in Wallonia, peaking at number 22, making it Blanche's highest-peaking single since "City Lights".

In the video, there is limited movement, instead it relies on bold outfits, colours and lighting to express an emotional message of "fear, power, abandonment, pain, introversion, self-unveiling, trust and authenticity".

[45] On 14 February 2020, Blanche announced that her debut album, titled Empire would be released on 24 April 2020.

[47] On 1 April 2020, Blanche announced that the release of her debut album would be delayed until 29 May 2020, due to the COVID-19 pandemic.

[53] On September 29, 2023, after a 19-month hiatus,[53] Blanche released the song "Shattered" written for the movie "Het Smelt" (also known by its English-language title "When It Melts"[54]).

[55] On October 18, her songs "Shattered - Reprise" and "Red Stop Sign" were released as part of the whole soundtrack of "Het Smelt" as well.