Emmy Rossum is a person.
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 starred in the science-fiction film The Day After Tomorrow ( 2004 ) and received critical acclaim for her performance in the leading role of Christine Daaé in The Phantom of the Opera ( 2004 ) . 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 ) . She also released a Christmas EP the same year , titled Carol of the Bells .