- Owns a house in Coussac-Bonneval, France.
- Is just 23 years younger than Laila Morse, who played her grandmother on EastEnders (1985).
- Is one of 7 EastEnders (1985) actresses to have won the Best Actress Award at the British Soap Awards; the others are Barbara Windsor, Patsy Palmer, Natalie Cassidy, Lacey Turner, Jessie Wallace and Kellie Bright.
- Maternal granddaughter of Frederick (1903-1966) and Susan (née Hope) Griffiths (1907-1963).
- A representative reported that Ainsworth suffered a miscarriage at 16 weeks pregnant (25 November 2002).
- Aunt of Jack (b. May 1991) and Perry Hennessey (b. September 1993), via her sister Suzanne.
- Is one of fifteen regular EastEnders (1985) actors to have appeared on Call the Midwife (2012) either in a main or a guest starring role. The others are Cliff Parisi, Lorraine Stanley, Tilly Vosburgh, Lacey Turner, Jenna Russell, Matilda Ziegler, Ted Reilly, Jasmyn Banks, Danny Walters, Lucy Speed, Kate Williams, Anita Dobson, Maggie O'Neill and Scarlett Alice Johnson. Of these fifteen, Ainsworth is one of eleven actors to have appeared on Call the Midwife (2012) after appearing on EastEnders (1985).
- Lives in Hertfordshire with fiancé Darren Hales and daughter Blossom.
- Gave birth to her son Elwood "Woody" Hales, fathered by her partner Darren Hales, one month prematurely (25 January 2008).
- Ranked #21 in the 100 Greatest EastEnders (1985) Characters of All Time for her performance as Little Mo Mitchell (2010).
- Ranked #28 in The 100 Greatest EastEnders (1985) Characters of All Time for her performance as Little Mo Mitchell (2015).
- Has an older sister, Suzanne Hennessey (née Ainsworth) (b. 1965).
- Her first child, a daughter with partner Darren Hales, was born on May 20, 2004. Blossom arrived at 3am at St John and St Elizabeth Hospital in St John's Wood, London, and weighed 6lb 12 oz. Kacey and Darren named their baby Blossom after the old English meaning lovely, and because she was born in May. Blossom's middle name is Mary.
- Daughter of Edward (1930-2006) and Hazel (née Griffiths) Ainsworth (b. 1943).
- Named by her mother after actress Kasey Rogers.
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