Natalie Ann Cassidy (born 13 May 1983) is a two time British Soap Award-winning English actress. She has played Sonia Fowler in EastEnders since 1993, appeared in the BBC Two sitcom Psychoville and was a contestant on the seventh series of Strictly Come Dancing and the ninth series of Celebrity Big Brother.
As a child, Cassidy attended the Anna Scher Theatre. She joined the cast of EastEnders in 1993, playing Sonia Jackson. In 2006, Cassidy played a rival to Lauren Cooper in an episode of The Catherine Tate Show screened on BBC Two. On 9 April 2006, the BBC announced Cassidy's departure from EastEnders with her final scenes being screened in February 2007. She then concentrated on work in the theatre, appearing in extensive UK tours of The Vagina Monologues, Bedroom Farce and Gertrude's Secret opposite Prunella Scales and a run of The Cherry Orchard at the Chichester Festival Theatre opposite Diana Rigg.