Williams was born and raised in Portuguese Elizabeth, South Africa. She has two older sisters who live in South Africa and a younger sister, Jade Williams, who moved to the United States of America with her and her mother, Mandy Morgan (previously Williams) when Nikki was 16 years old.
They lived in Los Angeles for 7 months and then moved to Nashville Tennessee. Several years later Nikki relocated to Los Angeles, she met Breyon Prescott and signed with his label Chameleon Entertainment/Island Def Jam. Her songwriting credits include Lauren Alaina"s "Like My Mother Does", Williams" "Fly Away" from the Country Strong and Demi Lovato"s "Heart Attack". Her debut single "Kill, Fuck, Marry", which was produced by Stargate and co-written by Sia Furler, was released on 19 November 2012.
Her second single "Glowing" was released on 4 December 2012.
The song was written by Williams, Arnthor Birgisson, Daniel James, Leah Haywood, Bebe Rexha and Sandy Vee, and produced by Vee. lieutenant debuted at Number. 48 on the Billboard Hot Dance Club Songs chart later reaching Number.
3 lieutenant also reached Number. 21 on the Billboard People’s Songs chart, and Number.
1 on the Billboard Bubbling Under Hot 100 chart.
Her third single "Thank God lieutenant"s Friday" was released on 15 November 2013 along with the lyric video which was posted on her VEVO page that same day. Williams has been working on her debut album, which was expected to be released in 2016.
