Emmy Rossum acts.
Emmanuelle Grey `` Emmy '' Rossum ( born September 12 , 1986 ) is an American actress , director and singer-songwriter . She is known for her portrayal of Fiona Gallagher in the television series Shameless . She has since starred in Poseidon ( 2006 ) , Dragonball : Evolution ( 2009 ) , Dare ( 2009 ) , Beautiful Creatures ( 2013 ) , Before I Disappear ( 2014 ) , You 're Not You ( 2014 ) and Comet ( 2014 ) . Mystic River is a 2003 American mystery drama film directed and scored by Clint Eastwood .