Stella was born in Murang'a in the Central Province of Kenya in 1986 and spent her first 5 years there before her family moved to Eidsvoll in Norway in 1991.[4] She started to practice playing music when she was eight years old. She also plays the piano. Her father made sure she and her siblings learned the Gikuyu language and Swahili even far away from home. He used cultural music and poetry to teach them the languages and this inspired Stella's music and her connection to the Kenyan culture.[5]
Mwangi's father was killed in a hit-and-run accident in February 2012.[6]
On 10 May, she represented Norway at the Eurovision Song Contest with the song "Haba Haba"[7] but failed to qualify for the Eurovision final, despite being one of the big favourites of the contest.[8]
Mwangi first topped the official singles chart in Norway in week 6, 2011 with her winning song "Haba Haba".[9]