Katherine Evelyn "Katie" Cassidy-Benedon (born November 25, 1986) is an American singer and actress, perhaps best known for starring in the remake of Black Christmas. She was cast as Ella Simms on Melrose Place in 2009.

Cassidy is the daughter of singer David Cassidy.

Katie was born in Los Angeles, California, the daughter of '70s pop idol David Cassidy and former model Sherry Benedon (née Kaltschnee); the two had an "on-again, off-again" relationship during the 1970s-1980s, resulting in Katie's birth in 1986, sixteen years after first meeting. Sherry and David remained close friends. Cassidy's paternal grandparents were actors Jack Cassidy and Evelyn Ward. She grew up in Calabasas, California with her mother and stepfather, Richard Benedon, an ER physician. David Cassidy was a part of her life in her younger years, and Katie now has a relationship with David. She has two successful older sisters, Jenna and Jamie. She also has a younger brother Beau Cassidy. As a child, Cassidy took to tumbling and eventually became a cheerleader for the California Flyers, a competitive team. She cheered as a freshman for Calabasas High School where she attended classes and graduated in 2005.