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Natalie Ann Cassidy (born 13 May 1983) is an English actress and television personality. She is known for her role as Sonia Fowler in the BBC soap opera EastEnders. She has also appeared in the BBC Two sitcom-horror series Psychoville in 2009 and was a contestant on the reality shows Strictly Come Dancing (2009), Celebrity Big Brother (2012) and The Masked Singer (2025).
Towards the end of 2007, Cassidy made headlines after losing a considerable amount of weight, and released a fitness DVD titled Natalie Cassidy's Then and Now Workout. In 2008, she starred in the BBC Three documentary Natalie Cassidy's Diet Secrets. In 2008, she was a regular panellist on Five's The Wright Stuff. Later that year, she again gained press coverage for giving up her diet and regaining weight. In 2009, Cassidy was cast in a supporting role in the BBC Two comedy television series Psychoville, alongside Dawn French and Eileen Atkins. She also provided the voice-over for BBC Three's Underage and Pregnant.
On 25 October 2009, it was announced that Cassidy would reprise her role as Sonia in EastEnders in 2010. She returned to the series for a short stint between 8 and 18 February 2010, and again for a single episode in 2011. In 2010, E4 announced that they would produce Cassidy's own reality show, Natalie Cassidy: Becoming Mum. On 5 January 2012, she participated in series nine of Celebrity Big Brother, and was the fifth housemate to be evicted. Prior to returning to EastEnders full-time, Cassidy was the host of The Health Lottery, a competition broadcast on Channel 5. She made a permanent return to EastEnders in 2014.
In August 2020, Cassidy appeared in the BBC comedy series Mandy. She also guest-starred in a 2021 episode of the BBC sitcom Motherland. In 2025, she competed in series six of The Masked Singer as Bush, reaching the semi-final. Around the same time, she announced that she would again be leaving her role as Sonia in EastEnders.
| + Cassidy's Strictly Come Dancing performance | ||||||
| 1 | Group Mambo | Group performance – not judged | ||||
| 2 | Tango / "Spider of the Night" | 6 | 24, 26 (safe) | |||
| Cha Cha Cha / "Bang Bang" | 6 | |||||
| 3 | Paso Doble / "Malagueña" | 7 | 28 (safe) | |||
| 4 | Salsa / "You'll Be Mine (Party Time)" | 7 | 29 (safe) | |||
| 5 | Viennese Waltz / "At Last" | 6 | 27 (safe) | |||
| 6 | American Smooth / "Please Don't Talk About Me When I'm Gone" | 7 | 29 (safe) | |||
| 7 | Jive / "Good Golly Miss Molly" | 8 | 30 (safe) | |||
| 8 | Quickstep / "Tu Vuo' Fa L'Americano" | 8 | 31 (safe) | |||
| 9 | Foxtrot / "Magic Moments" | 8 | 34 (safe) | |||
| 10 | Samba / "Holiday" | 5 | 26 (safe) | |||
| 11 | Rock and Roll / "Long Tall Sally" | 7 | 26 (eliminated) | |||
In 2013, she was also impersonated by impressionist Philip Green on series seven of Britain's Got Talent.
Since 2014, Cassidy has been in a relationship with cameraman Marc Humphreys. In October 2015, it was announced that the couple were engaged, and a few months later, on 13 February 2016, Cassidy revealed she was pregnant with her second child. She gave birth to their daughter in August 2016.
In January 2019, it was announced that she would be running the London Marathon with some of her EastEnders co-stars for a dementia campaign in honour of their former castmate Barbara Windsor.
| +Television ! Year ! Title ! Role ! Notes | |||
| 1993–2007, 2010–2011, 2014–2025 | EastEnders | Sonia Fowler | Regular role |
| 1999 | Pudding Lane | Charity special | |
| 2004 | Natalie Cassidy Goes Wild in Australia | Herself | Documentary |
| 2006 | The Catherine Tate Show | Cheerleader | Episode: "1951–2006" |
| 2008 | Natalie Cassidy's Diet Secrets | Herself | Documentary |
| The Wright Stuff | Regular panellist | ||
| 2009 | Things Talk | Sofa / Satsuma | Voice role |
| Psychoville | Lorraine | 2 episodes | |
| Natalie Cassidy's Real Britain | Presenter | 6 episodes | |
| Strictly Come Dancing | Herself | Series 7 contestant | |
| 2010 | Natalie Cassidy: Becoming Mum | Main role | |
| 2009–2011 | Underage and Pregnant | Narrator; 22 episodes | |
| 2012 | Celebrity Big Brother | Series 9 contestant | |
| Crime Stories | Hannah Stevenson | Series 1, episode 15 | |
| 2020 | Mandy | Donna Ball | Episode: "Broadsword to Donna Ball" |
| 2021 | RuPaul's Drag Race UK | Herself | Episode: "BeastEnders" |
| Motherland | Ms Vaughn | Episode: "School Trip" | |
| 2022 | The Train | Passenger | Web series; episode: "Autumn" |
| 2025 | The Masked Singer | Herself / Bush | Series 6 contestant |
| Boarders | Sharon Hail | Series 2, episode 5 | |
| What's the Big Deal: Britain's Best Buys | Presenter | Four-part consumer affairs show | |
| Natalie Cassidy Learning to Care | Herself | Upcoming series |
| +Video ! Year ! Title ! Role ! Notes | |||
| 2007 | Natalie Cassidy's Then and Now Workout | Herself / Presenter | Fitness DVD |
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