Sophie Turner is an actress.
Sophie Turner ( born 21 February 1996 ) is an English actress . Turner made her professional acting debut as Sansa Stark on the HBO fantasy television series Game of Thrones ( 2011 -- present ) , which brought her international recognition and critical praise . She has also starred in the action comedy Barely Lethal ( 2015 ) and played Jean Grey / Phoenix in the X-Men film series .