Sasha Pieterse-Sheaffer (/ˈpiːtərsə/; born February 17, 1996) is a South African-born American actress, singer and songwriter. She is known for her role as Alison DiLaurentis in the Freeform series Pretty Little Liars. Upon the success of Pretty Little Liars, Pieterse earned a supporting role as Amy Loubalu in the 2011 Disney Channel film Geek Charming.
In 2013, she starred in the teen comedy film G.B.F.. In 2017, Pieterse participated in the 25th season of Dancing with the Stars and finished in 10th place.