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"Pretty Little Liars spinoff Ravenswood has cast two new stars. Brett Dier (Smallville, Supernatural) and model Elizabeth Whitson will play twin siblings on the ABC Family series, TVLine reports.  Dier will star as a &amp;quot;brooding loner&amp;quot; while Whitson&amp;#039;s character is described as a former &amp;quot;queen bee&amp;quot;. Ravenswood will premiere after the Halloween episode of Pretty Little Liars in October. Tyler Blackburn - who currently plays Caleb Rivers on the parent series - will move to the spinoff, which follows five strangers connected by an ancient curse. 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/a479219/pretty-little-liars-spinoff-ravenswood-adds-two-stars/>