Del Sierra was born Émilie Delaunay in Pontoise, in the Parisian region.

[8] After shooting a gonzo in France with Manuel Ferrara, she went to work in the United States, where she received several AVN Awards nominations.

[9] On July 11, 2011, Complex ranked her eightieth on their list of "The Top 100 Hottest Porn Stars (Right Now)".

[10] Her American career helped her to achieve more fame in her home country,[6] where she became familiar to the general public in the early 2010s.

[12] In 2014, the production of one of her films as a director was the subject of a documentary about the porn industry, broadcast on France 2.