Katherine Evelyn Anita Cassidy was born on Nov. 25, 1986 in Los Angeles, CA. Her father, David Cassidy, was a pop star who rose to superstardom in the early 1970s with the hit song "I Think I Love You" and for playing teen poster boy Keith Partridge on "The Partridge Family." Her mother, Sherry was a high fashion model who retired to raise her children. Cassidy's family was also a "Who's Who" of Hollywood names.
She slid into the feature arena inauspiciously, as Kelli, one of the slasher victims in the grotesque, critically panned gorefest Black_Christmas, then traveled the comedic route with supporting roles in the Adam_Sandler vehicle Click (2006), the ensemble picture You_Are_Here (2007, as an aspiring Hollywood climber), and the Cary_Elwes comedy Walk the Talk (2007). Cassidy is perhaps best known, however, for her recurring role as Ruby on Supernatural, a program about a couple of young men journeying across the country in their black Impala and fighting off evil supernatural forces.
At that time she was busy working on five feature film productions going on almost simultaneously. Katie made several appearances in TV series, such as "7th Heaven" (1996) and "Sex, Love & Secrets" (2005), among others. She appeared as Samantha, the grown-up daughter of Adam Sandler and Kate Beckinsale in the comedy Click (2006). After the release of a teen horror film, When a Stranger Calls (2006), in which she co-starred as Tiffany, Cassidy went to Vancouver to work on her second horror film, Black Christmas (2006), in which she stars as a sorority girl. Katie recently beat out the likes of Jessica Simpson and Kristin Cavallari for the leading role opposite John Travolta as his daughter and the heir to the most powerful energy company in the world in Dallas (????), the big-screen remake of the cult TV series.