She began working as an extra in the daytime TV drama series Guiding Light.
She won the Best Actress award in the Locarno International Film Festival for her role of Samantha in the 2005 movie Nine Lives.
Her breakthrough role came as she played Sarah Henrickson in the highly acclaimed drama Tv series, Big Love.
Her father, Jack Seyfried is a Pharmacist and her mother Ann is an occupational therapist. She went to William Allen High School and graduated from there in 2003.
She has mostly German descent and also has parts of Scots-Irish and English descent.
She also wrote and recorded the song Little House for her movie Dear John alongside Channing Tatum which was released on February 5, 2010.