Caitlin Jean Stasey (born May 1, 1990) is an Australian actress from Melbourne who is best known for her role as Rachel Kinski in Neighbours, although her breakthrough movie role came inTomorrow, When the War Began, a 2010 movie adaption of the teen novel of the same name in which she played lead protagonist Ellie Linton. She also played Lady Kenna in the American series Reign from 2013 to 2015. In The Sleepover Club, she plays Frankie .