Jessalyn Sarah Gilsig (born November 30, 1971) is a Canadian actress. She is best known for her roles as Meredith Gordon in Heroes, Kayley in Quest for Camelot, Lauren Davis in Boston Public, Gina Russo in Nip/Tuck, Terri Schuester in Glee, and as Siggy Haraldson in Vikings. (Via Wikipedia)