Ruiz was born at Carcassonne, daughter of musician Didier Blanc though later taking her grandmother's maiden name Ruiz. In 2001, she was a prominent contestant in the first French edition of Star Academy, a popular TV reality-show and musical contest. She was defeated in the semi-final by eventual winner Jenifer Bartoli but according to an interview on Europe 1 she claimed that she never wanted to win and, following a post-series tour, worked to distance herself from the Star Ac image.

For her second studio album La Femme Chocolat, Olivia Ruiz was recognised by the Victoires de la Musique as the Female Artist of the Year in 2007. For the live performances accompanying the record, she also received the prize in the category of Musical Show, Tour or Concert of the Year. The album topped the French chart and was certified as a diamond record for selling more than 750,000 copies in France and made it to the top 50 of the Walloon and Swiss charts. Off the album, the music videos of the tracks "J'traine des pieds" and "La femme chocolat" were placed on rotation on the MCM French TV channel in 2006. The singles made it to the top 50 of the French and Walloon charts.

Olivia Ruiz wrote all the lyrics for her third studio album Miss Météores, co-orchestrated the music and employed a crew of guest stars including the rapper Buck 65, the indie band Noisettes and the folk and dark cabaret project Lonely Drifter Karen and featured the styles of nouvelle chanson, punk, folk and Hispanic rock. The record topped the French and Walloon album charts in 2009. Off the album, the single "Elle panique", with the music written by Buck 65 peaked at #2 of the Walloon chart. The music video of the song was placed on rotation on the MCM in May 2009. Her partner is Mathias Malzieu, the lead singer of the band Dionysos.

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