Sienna Tiggy Guillory (pronounced /ˈɡɪləri/) (born 16 March 1975) is an English actress, and a former model. She is the daughter of Isaac Guillory, an Anglo-Cuban folk guitarist, and the family environment gave her an interest in the entertainment industry. She has been featured in numerous British and American productions. More recently, Guillory has appeared in a number of science-fiction and fantasy themed films aimed at teenage audiences.
Guillory, who was sixteen and still at school, began her career with a role in the television series Jilly Cooper's Riders. Following more small television and film roles, she modelled for a few years to support her acting. She was featured in campaigns by Armani, Dolce & Gabbana, Burberry, and Paul Smith, but her biggest job was as the face of the Hugo Boss fragrance campaign from 1999 to 2002. Afterwards, Guillory focused her career in mostly English and BBC productions; the BBC adaptation of Take a Girl Like You, a three-part miniseries broadcast in November 2000, was something of a breakthrough role. In 2003, Guillory played the title role in the US miniseries Helen of Troy. She went on to gain lead roles in films with a broader audience