From Wikipedia:

Nicole Evangeline Lilly (born August 3, 1979) is a Canadian actress known for her role as Kate Austen in one of ABC’s most successful programs of all time, Lost, a role for which she won multiple Saturn Awards and Teen Choice Awards and a Golden Globe nomination.  Lilly is also known for her roles in the feature films Afterwards, The Hurt Locker, and Real Steel.

In 2012, Lilly was cast to play the role of the Woodland Elf Tauriel in Peter Jackson‘s three-part adaptation of J.R.R. Tolkien‘s The Hobbit.  The character, which does not appear in the original book by Tolkien, was created by Peter Jackson and Fran Walsh as the head of the Elven guard who, like Legolas (who also appears in the film), wields a bow and two daggers as weapons. Lilly, who had been a fan of Tolkien’s books since she was 13,^[underwent training for swordplay and archery, as well as in the Elvish language for the role

In 2013 her book “The Squickerwonkers” (illustrated by Weta artist Johnny Frazier Allen) was released.