Christie was born and raised in Huddersfield, in West Yorkshire until the age of 13, when she was awarded a music scholarship to study flute, piano, and voice[2] at Oundle School in Northamptonshire.
[citation needed] Christie joined the National Youth Theatre at 17, where she made her breakthrough stage role in Immaculate Conceit, a play about a stripper who is pregnant with the next messiah.
After a five-month tour of India performing Shakespeare's A Midsummer Night's Dream in Jaipur in 2006, she returned to Britain,[6] but endured a lean year and nearly gave up acting altogether when she landed the role of Jill Mason in her West End debut in Equus at the Gielgud Theatre.
[citation needed] She beat over 300 other actresses to the role opposite Harry Potter star Daniel Radcliffe in Thea Sharrock's high-profile revival of Peter Shaffer's award-winning play.
"[8] On 20 April 2014, she collaborated with her Once cast members and contributed her piano and vocal talents for a live-album recording of the Adam Brown and Friends performance at the Bowery Poetry Club.