Karen Lucille Hale (born June 14, 1989) is an American actress and singer. Earlier in her career, she was sometimes credited as Lucy Kate Hale. Hale first came to prominence as one of the five winners of the reality show American Juniors, a children's spin off of American Idol. She is best known for her role as Aria Montgomery on the Freeform series Pretty Little Liars, which won her a People's Choice Award for Favorite Cable TV Actress in 2014. The same year, she released her debut studio album, Road Between.

Answer this question: who plays as aria in pretty little liars? Let's give stream of consciousness first:
The important part for answering this question is: She is best known for her role as Aria Montgomery on the Freeform series Pretty Little Liars, which won her a People's Choice Award for Favorite Cable TV Actress in 2014.
So, the final answer is Karen Lucille Hale.