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"Pretty Little Liars spinoff Ravenswood has cast Merritt Patterson as a series regular. Patterson (Supernatural, Kyle XY) will play Tess, former friend of &amp;quot;queen bee&amp;quot; Olivia (Elizabeth Whiston), according to The Hollywood Reporter.  Whiston&amp;#039;s own casting was announced yesterday (May 7) alongside that of Brett Dier - the pair will play twin siblings in the new series. Ravenswood will follow five strangers connected by an ancient curse. Tyler Blackburn - who currently plays Caleb Rivers on the parent series - will move to the spinoff, which is set to premiere after the Halloween episode of Pretty Little Liars in October. Pretty Little Liars has also been picked up for a fifth season, ahead of the fourth season premiere on June 11 at 8/7c. &amp;gt; Pretty Little Liars star Ryan Merriman engaged to girlfriend Watch a promo for season four of Pretty Little Liars below:      "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.digitalspy.com/tv/ustv/news/a479601/pretty-little-liars-spinoff-ravenswood-adds-merritt-patterson/>