Daughter of James Wallace (b. 1944) and Annette (née Leach) Mason (b. 1952).
Sister of Joanne (née Wallace) Harman (b. 1968) and Danielle Mason (b. 1983).
Jessie worked as a make-up artist at the Royal Shakespeare Company for 2 years before becoming an actress.
Was 6 months pregnant with her daughter Tallulah when she went on maternity leave from EastEnders (1985).
Despite playing her older sister on EastEnders (1985), Wallace is 3 years younger than Kacey Ainsworth.
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, Kacey Ainsworth, Lacey Turner and Kellie Bright.
Her EastEnders (1985) character Kat Slater's wedding to Alfie Moon (Shane Richie), dated on December 25, 2003, is ranked #4 in "The 50 Greatest EastEnders (1985) Weddings of All Time" (2010).
Her EastEnders (1985) character Kat Slater's wedding to Andy Hunter (Michael Higgs), dated on November 14, 2003, is ranked #14 in "The 50 Greatest EastEnders (1985) Weddings of All Time" (2010).
Ranked #20 in the 100 Greatest EastEnders (1985) Characters of All Time for her performance as Kat Moon (2010).
Her EastEnders (1985) character Kat Moon became the 24th woman on the soap opera to give birth. Kat had a son Tommy (played initially by Ralfie White, then Shay Crotty, and now Henry Proctor), born on December 30, 2010 and twins Bert and Ernie (played by Freddie and Stanley Beale), born on August 8, 2014.
Is one of 23 EastEnders (1985) actors to compete in Strictly Come Dancing (2004). The others, in chronological order, are Christopher Parker (Spencer Moon), Jill Halfpenny (Kate Mitchell), Patsy Palmer (Bianca Jackson), Louisa Lytton (Ruby Allen), Letitia Dean (Sharon Rickman), Matt Di Angelo (Deano Wicks), Phil Daniels (Kevin Wicks), Gillian Taylforth (Kathy Mitchell), Zöe Lucker (Vanessa Gold), Ricky Groves (Garry Hobbs), Natalie Cassidy (Sonia Fowler), Jimi Mistry (Fred Fonesca), Scott Maslen (Jack Branning), Kara Tointon (Dawn Swann), Anita Dobson (Angie Watts), Sid Owen (Ricky Butcher), Jake Wood (Max Branning), Kellie Bright (Linda Carter), Tameka Empson (Kim Fox-Hubbard), Davood Ghadami (Kush Kazemi), Charles Venn (Ray Dixon), and Lee Ryan (Woody Woodward).
Was in an on/off relationship with Dave Morgan (April 2003-February 2005).
Gave birth to her 1st child at age 33, a daughter Tallulah Lilac Morgan on November 2, 2004. Child's father is her now ex-fiancé Dave Morgan.
Was forced to take early maternity leave from EastEnders (1985) after being hospitalised at 6 months pregnant, having almost lost her baby due to stress.
Is just 26 years younger than Laila Morse, who played her grandmother on EastEnders (1985).
Returned to work 3 months after giving birth to her daughter Tallulah in order to resume filming EastEnders (1985).
Aunt of Mitchell (b. 1990), Jake (b. 1993), Kaylee (b. 1996) and Josh (b. 1998), via her sister Joanne and her husband Paul Harman, and Rudy (b. 2011) and Delilah (b. 2013), via her sister Danielle Mason and her ex-fiancé Tony Giles.
Was in consideration for the part of Ellie in Hope Springs (2009), but Alex Kingston was cast instead.
Was engaged to caterer Vincent Morse, having been in a relationship with him since July 2010 (April-August 2011).
Was in a relationship with Tim Arnold from April 2012 until February 2016, having been introduced by his mother and her EastEnders (1985) co-star Polly Perkins.
Is one of eight EastEnders (1985) actors to have won the Best Newcomer Award at the British Soap Awards; the others are Alex Ferns, Nigel Harman, Charlie Clements, Marc Elliott, Maddy Hill, Bonnie Langford and Lorraine Stanley.
Ranked #9 in the 100 Greatest EastEnders (1985) Characters of All Time for her performance as Kat Moon (2015).
Her favourite actor is Jack Lemmon and her favourite actress is Anna Magnani.
As of 2020 she is the 9th-longest serving actress on the history of EastEnders (1985) (behind only June Brown, Pam St. Clement, Letitia Dean, Wendy Richard, a tied Gillian Taylforth and Natalie Cassidy, a tied Barbara Windsor and Laila Morse, Gillian Wright, and a tied Diane Parish and Linda Henry), having played the character Kat Moon for a total of 13 years (initially from 2000 until 2005, then from 2010 until 2016, and now from 2018 onwards).
Maternal granddaughter of Ernest William (1930-1976) and Iris Rosina (née Bird) Leach (1928-2003).
Her musical influences are Marie Lloyd and Georgia Brown.
Some of her favourite films include Rebel Without a Cause (1955), The Rose Tattoo (1955), Some Like It Hot (1959), Kes (1969), Ryan's Daughter (1970), E.T. the Extra-Terrestrial (1982), Wish You Were Here (1987) and Cinderella (2015).
Worked alongside her former EastEnders (1985) screen husband Shane Richie on three separate projects after they quit the soap opera in January 2016; the UK tour of "A Perfect Murder", the EastEnders (1985) TV spin-off Redwater (2017), and the pantomime "Robin Hood". They played husband and wife in all three of these projects.