Sasha Pieterse (/ˈpiːtərsə/; born February 17, 1996) is a South African-born American actress and singer-songwriter. She is known for her role as Alison DiLaurentis in the Freeform series Pretty Little Liars. Upon the success of the series, 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.. She is also a main character in the Netflix Original Coin Heist, which premiered in 2017.