Before going on maternity leave, she presented on the BBC's online interactive service.
Reid then spent three months doing charity work in Sri Lanka, before becoming a reporter for Breakfast News.
After a second maternity break, Reid became a presenter on the BBC News channel.
She has held her current role since 2012, when she replaced Sian Williams.
In 2010 she stepped down from presenting Breakfast on Saturdays and Sundays to take a role on a new programme Sunday Morning Live.
As of the final episode of the first series on 21 November 2010, she resumed her weekend presenting duties on BBC Breakfast within 2 weeks.
The youngest of three children, Reid was born in Croydon, South London to an English father of Scottish ancestry, who worked as a management consultant, and an English mother who worked as a nurse.
Her parents separated and divorced when she was aged 9.
Reid was educated at the independent Croham Hurst School, Croydon from 1975–81, where comedienne Sue Perkins was amongst her classmates, followed by the independent Croydon High School (1981–87) and St Paul's Girls' School (1987–89) in London.
Reid studied Politics, Philosophy and Law at the University of Bristol (1989–92), where she was editor of Epi Gram, the university's student newspaper, when it was short-listed for Best Student Newspaper in 1991 The Guardian/NUS student journalism awards.
She then undertook a Postgraduate Diploma in Broadcast Journalism from the Cardiff School of Journalism.
Reid started her career at BBC Radio Bristol and then became a reporter for Radio 5 Live, as well as a producer.
She then joined BBC News 24 where she spent two years as a reporter.
When the presenter didn't turn up one night, she became a stand-in presenter for an hour (while three months pregnant with her first child), which turned into a permanent position.