The main stars are: Lucy Hale (Aria), Ashley Benson (Hannah), Troian Bellsario (Spencer), and Shay Mitchell (Emily)

This series is based upon the books.

The books are written by Sara Shepard.

Pretty Little Liars is the first book in the seires.

Flawless is the second book in the series.

Perfect is the third book in the series.

Unbelievable is the fourth book in the series.

Wicked is the fifth book in the seires.

Killer is the sixth book in the series.

Heartless is the seventh book in the series.

Wanted is the eighth book in the series.

Twised is the nineth book in the series.

Ruthless is the tenth book in the series.

Stunning is the eleventh book in the series, it comes out December 6th.

The winter finaly premiers on January second.

The place you can look up pretty little liars is http://abcfamily.go.com/shows/pretty-little-liars/.