- Parents, Colin and Marilyn, performed as a Country and Western duo called The Daltons.
- Studied at the Joyce Mason School of Dancing in Scunthorpe, England.
- Made her professional debut at the age of 14 in a production of Annie, playing the lead role.
- Performed in Shakespearean plays A Midsummer Night's Dream and Taming of the Shrew at the Open Air Theatre in London's Regents Park in 2006.
- Played Bridget Jones in a workshop for a musical version of Bridget Jones' Diary in 2010, but a proper version of the show never happened.
- Brother Damien is a member of the band Indie Manned.
- Appointed an Officer of the Order of the British Empire (OBE) in 2015.
- 2015, BAFTA Television Awards — Best Actress: Nominee
- 2015, National Television Awards — Drama Performance: Winner
- 2013, AACTA Awards — Best Lead Actress in a Television Drama: Nominee
- 2012, Olivier Awards — Best Supporting Performance: Winner
- 2016, National Television Awards — Drama Performance: Nominee
- 2017, Olivier Awards — Best Actress in a Musical: Nominee
- 2018, National Television Awards — Drama Performance: Nominee
- 2016, BAFTA Television Awards — Best Actress: Nominee
- Marilyn Smith — Mother
- Damien Smith — Brother
- Colin Smith — Father
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