Sienna Tiggy Guillory (/ˈɡɪləri/; born 16 March 1975) is an English actress and former model. She portrayed Jill Valentine in several entries of the Resident Evil action-horror film series. Other prominent roles include elf princess Arya Dröttningu in the fantasy-adventure film Eragon, and the title role in the TV miniseries Helen of Troy. She has appeared in TV shows including Fortitude, Stan Lee's Lucky Man, and Luther.