The evolution of actual teen Sasha Pieterse as actual teen Alison DiLaurentis on Pretty Little Liars.

Top left: 14-year-old Sasha as 14-year-old Alison.

Top right: 15-year-old Sasha as 14-year-old Alison.

Bottom left: 16-year-old Sasha as 14-year-old Alison.

Bottom right: 17-year-old Sasha as... 17*-year-old Alison (how old are the girls meant to be currently?)