From Wikipedia, the free encyclopedia Natalie Ann Cassidy is an English actress. She has played Sonia Fowler in EastEnders since 1993, appeared in the BBC Two sitcom-horror Psychoville and was a contestant on the seventh series of Strictly Come Dancing and the ninth series of Celebrity Big Brother. Description above from the Wikipedia article Natalie Cassidy, licensed under CC-BY-SA, full list of contributors on Wikipedia.