Lucy Hale as Aria Montgomery, Shay Mitchell as Emily Fields, Troian Bellisario as Spencer Hastings and Ashley Benson as Hanna Marin on 'Pretty Little Liars' Got a secret, can you keep it? ... Pretty ...

Got a secret, can you keep it? ... Pretty Little Liars is turning 15 years old! Freeform's hit teen drama premiered on June 8, 2010, and quickly became a cultural phenomenon, dominating social media ...