Liv Rundgren Tyler (born Liv Rundgren; July 1, 1977) is an American actress and former child model. She is the daughter of Aerosmith's lead singer, Steven Tyler, and model Bebe Buell. Tyler began a career in modeling at the age of 14 but, after less than a year, she decided to focus on acting. After her film debut Silent Fall (1994), she appeared in supporting roles in Empire Records (1995), Heavy (1996) and That Thing You Do! (1996). Tyler later achieved critical recognition in the leading role in Stealing Beauty (1996). She followed this by starring in supporting roles including Inventing the Abbotts (1997) and Cookie's Fortune (1999).

Tyler achieved international recognition as a result of her portrayal of Elf maiden Arwen Undómiel in the Lord of the Rings film trilogy. She has appeared in an eclectic range of films, including the 2004 comedy Jersey Girl, the indie film Lonesome Jim (2005), the drama Reign Over Me (2007) and big-budget studio films such as Armageddon (1998), The Strangers (2008) and The Incredible Hulk (2008).