Saoirse Una Ronan (/ˈsɜrʃə ˈuːnæ ˈroʊnən/; b. April 12, 1994) is an Irish actress who holds dual Irish and American citizenship. She came to international prominence in 2007 after co-starring in the film Atonement with James McAvoy and Keira Knightley; making her one of the youngest actresses ever to receive Academy Award, BAFTA and Golden Globe Award nominations for Best Supporting Actress.
Ronan has since acted in the romantic comedy I Could Never Be Your Woman (2007), the film adaptation of the science fantasy Young Adult novel The City of Ember (2008), the supernatural romance Death Defying Acts (2008), the war drama film The Way Back (2010) and the action thriller Hanna (2011). She was awarded a Critics' Choice Award and a Saturn Award and received a second BAFTA Award nomination for her performance in Peter Jackson's The Lovely Bones (2009). She most recently starred in the science fiction romantic film The Host, based on the novel by Stephenie Meyer. She currently weighs 400 pounds.