Natalie Cassidy seemed worlds away from Sonia Fowler over the weekend as she let her hair down to celebrate her 40th birthday surrounded by her EastEnders co-stars.The actress, who has starred on the BBC soap on-and-off since 1993, celebrated her milestone birthday with a huge party that saw most of Albert Square's biggest stars forget the troubles of Walford as they hit the town. Natalie – who has opened up on her fitness journey – looked gorgeous in a white suit as she partied the night away at a pub in Essex with her nearest and dearest, including boyfriend Marc Humphreys.