Who knew David Cassidy had a daughter? Well, we did.24-year-old Katie Cassidy is David's daughter with model Sherry Williams, who he dated on and off in the '70s and '80s. Katie was raised by her mother and her step-father, ER doctor Richard Benedon, but as "Celebrity Apprentice" viewers saw tonight, she remains close to her famous father. Though he struggled to raise money for his team, Katie donated a grand to the cause.
