- Met ex-husband James McAvoy while filming Shameless (2004).
- Almost turned down her role in Shameless (2004). However, her mother changed her mind, saying that the script rang true because "it is about what people have when they don't have anything except laughter, sex and the stars".
- Gave birth to her first child at age 39, a son Brendan Duff McAvoy on 26 February 2010 at St Mary's Hospital, Praed Street, Westminster. The child's father is her husband (now ex-husband), James McAvoy.
- She was nominated for the Laurence Olivier Theatre Award in 2000 (1999 season) for Best Supporting Actress for her performance in "Collected Stories" at the Haymarket Theatre.
- Duff grew up on a council estate in Hayes, a suburb of west London.
- Duff said her son is named after her dad Brendan, a painter and decorator who moved to Britain with his wife Mary from Ireland. She and her husband James McAvoy chose not to know the sex of the baby before his birth in London in 2010.
- She studied at The Drama Centre in London.
- Her parents, Brendan and Mary, were from counties Donegal and Meath in Ireland and met in England. She has one brother, Eddy.
- She is of Irish descent.
- Of Clan MacDuff.
- Beginning her run as "Mona", a young alcoholic, in Owen McCafferty's "Days of Wine and Roses" at the Donmar Warehouse Theatre, London. (March 2005)
- Her parents are from Donegal, Ireland.
- Nominated for the Ian Charleson Award for her performance in "King Lear" at the RNT.
- Won the Evening Standard Best Actress Award for 'Saint Joan'.
- Attended The Drama Centre, the drama school in north London that produced near contemporaries such as John Simm, Paul Bettany and Helen McCrory.
- Appearing as "Joan of Arc" in George Bernard Shaw's "St. Joan" at the Royal National Theatre in London's South Bank. Play runs until end September 2007. (August 2007)
- Has won two Evening Standard Theatre Awards for 'Sweet Charity' and 'Saint Joan'.
- Despite playing her daughter on Shameless (2004), Duff is only 7 years younger than Annabelle Apsion.
- Returned to work 9 months after giving birth to her son Brendan in order to begin performing in "Cause Célèbre" at The Old Vic theatre.
- Ex-sister-in-law of Joy McAvoy.
- Born on exactly the same date as Matt Damon.
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