Born: February 17, 1996 (age 17), Johannesburg
Occupation: Singer-songwriter, Actor, Model
Biography: Sasha Pieterse is a South African born American actress and singer. She is known for her role as Alison DiLaurentis on ABC Family's TV series Pretty Little Liars.
The cast and producers give us the scoop on the season 4 Halloween episode of 'Pretty Little Liars.'