Anastasia Stepanova (Russian: Анастасия «Настя Стен» Степанова; born 22 March 1995), known professionally as Nastya Sten, is a Russian fashion model. Sten was born in Moscow, Russia.

She started her modeling career when she was 17. The first serious work for her became the Proenza Schouler spring/summer 2014 fashion show during New York Fashion Week. Fall/Winter 2014–15 season became breakthrough for Sten.