Abbie Cornish , also known by her rap name MC Dusk is an Australian actress and rapper. Following her lead performance in 2004's Somersault, Cornish is best known for her film roles as Fanny Brawne in Bright Star , Sweet Pea in Sucker Punch , Lindy in Limitless and for her work with writer/director Martin McDonagh in Seven Psychopaths and Three Billboards Outside Ebbing, Missouri . Since 2018, she portrays Cathy Mueller in the Amazon Video series Jack Ryan opposite John Krasinski.Personal lifeCornish was born in Lochinvar, New South Wales, Australia, as the second of five children of Shelley and Barry Cornish. Her sister, Isabelle Cornish, is also an actress. She grew up on a 70-hectare farm before moving to Newcastle, New South Wales.