Cécile Crochon, better known by the stage name Cécile Cassel (born 25 June 1982), is a French actress and singer. Since 2002, she has appeared in a number of films and television series. She is also a recording artist using the stage name HollySiz. She is the half-sister of actor Vincent Cassel and MC Mathias Cassel, and the daughter of Jean-Pierre Cassel. Source: Article Cécile Cassel from Wikipedia in english, licensed under CC-BY-SA 3.0.