Dichen Lachman (/ˈdiːtʃən ˈlækmən/ DEE-chən LAK-mən; born 22 February 1982) is an Australian actress and model. She gained recognition starring as Katya Kinski in the soap opera Neighbours (2005–2007) and Sierra in Joss Whedon's science fiction drama series Dollhouse (2009–2010).