Katie Cassidy -- the daughter of onetime Partridge Family sensation and teen idol David Cassidy and fashion model Sherry Williams -- jump-started her fame not as an actress but as a teen pop star, à la Britney Spears or Jessica Simpson. A trained vocalist from the age of 12, Katie teamed up with music mega-producer Joel Diamond in 2004, and released her first single that summer, banking off of her...
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