In "The Lord of the Rings" film series, who portrayed Arwen Undómiel?

Arwen Undómiel is a fictional character in J. R. R. Tolkien's Middle-earth legendarium. She appears in the novel The Lord of the Rings. Arwen is one of the half-elven who lived during the Third Age; her father was Elrond half-elven, a descendant of the Man Tuor, while her mother was the Elf Celebrian, daughter of the Elf-queen Galadriel. In the novel, she marries the Man Aragorn, who becomes King of Arnor and Gondor, thus adding long life and nobility to his dynasty.

In Peter Jackson's film adaptation, Arwen is played by Liv Tyler.

Liv Tyler (born Liv Rundgren; July 1, 1977) is an American actress, producer, singer and former model. She is best known for her portrayal of Arwen Undómiel. Tyler began a career in modeling at age 14. She later decided to focus on acting and made her film debut in Silent Fall (1994); she went on to achieve critical recognition with starring roles in Heavy and Empire Records (both 1995), as well as That Thing You Do! and Stealing Beauty (both 1996). She then appeared in films such as Inventing the Abbotts (1997), Armageddon (1998), Cookie's Fortune and Onegin (both 1999), Dr. T & the Women (2000) and One Night at McCool's (2001).