Tanja Mirjam Cecilia Lorentzon (née Tanja Mirjam Cecilia Koukonen; born 25 September 1971), previously known as Tanja Svedjeström, is a Sweden-Finnish actress and dramatist of Finnish descent. Internationally, she is probably best known for her role of Sonja Modig in The Girl Who Played with Fire and The Girl Who Kicked the Hornets' Nest, film adaptations of the Millennium series by Stieg Larsson.