Kacey Clarke (born Kacey Louisa Barnfield; 14 January 1988) is an English actress. As a teenager she played Maddie Gilks in the long running British television series Grange Hill, on which she spent six years. As an adult, her roles have included Crystal in the American action film Resident Evil: Afterlife, and Katie Sutherland in British comedy The Inbetweeners. In 2014, Clarke was listed as number 99 in FHM's 100 sexiest women in the world.
Clarke was born in the London Borough of Enfield as Kacey Louisa Barnfield to parents Malcolm, a partner at Enfield estate agency, Barnfield's, and Karen (née Clarke). Her parents divorced in 2010. She has a brother Kye and a sister Tyla. Clarke is a second cousin of the actress Victoria Shalet. Clarke splits her time between London and Los Angeles, maintaining a base in both cities.
Clarke's began acting in 1997 at age nine, appearing in advertisements and stage plays. In 2000, Barnfield's won the role of bully Maddie Gilks, girlfriend to Baz Wainwright (played by Thomas Hudson), in Grange Hill, where she found herself the central role in central plots during her five-year stint on the show, It was Clarke's first major acting role.