ABC Family

7 Things You Didn't Know About 'Pretty Little Liars'

Even A never knew these secrets.

As any fan of the series knows, on "Pretty Little Liars," it's all about keeping secrets -- but at MTV News, we just can't help but spill the beans. In this exclusive video, find out all of the behind-the-scenes gossip from ABC Family's hit series, from casting drama to little-known "Liar" roles to the never-ending teenage years of Bianca Lawson.

Just don't tell A, k?