Kidd was born in 1978, the daughter of the businessman and former showjumper Johnny Kidd. Kidd's maternal great-grandfather was the Canadian press baron Max Aitken, 1st Baron Beaverbrook. Kidd's mother, Wendy Madeleine Kidd (neé Hodge), is one of the three daughters of Sir John Rowland Hodge, 2nd Baronet, and runs the Holders Festival on Barbados. Kidd's aunt is the model Vicki Hodge.
Jodie was a showjumper as a child and attended St Michael's School, Burton Park, Petworth, West Sussex. Kidd has two siblings. Her elder sister, Jemma Kidd (born 1974), married Arthur Gerald Wellesley, Marquess of Douro, son of the current Duke of Wellington in June 2005. Kidd's brother, Jack Kidd (born 1973) is a polo player. Kidd also has a half brother, the entrepreneur Nick D'Arcy Whiting (born 1962) and a half sister Debbie Parris (born 1964).
Kidd was 15 when she was discovered by photographer Terry O'Neil on a beach in Barbados. Her modelling career began when he introduced her to model agent Laraine Ashton. When Kidd began modelling at 16 there was an uproar – accusations were made that promotion of her slender figure encouraged teenage girls to become anorexic when they tried to mimic her looks. Her skeletal figure led to accusations, because she is tall 185 cm (6 ft 1) and at the time her weight was 48 kg (106 lb) (BMI of 13.6; WHO class at 16 years, "severe thinness") and a German magazine called her "locuste model", sometimes referred to as "heroin chic". However, following an eight-month break in modelling, Kidd increased weight to become a Size 14 dress size.
Kidd modelled with the leading models from Capellino, Chanel, Ernesto Esposito, Fendissime, Gai Mattiolo, Ghost, Lagerfeld, Malhas, Monsoon, and Motorola and also featured in campaigns for Chloé 'Innocence' perfume and Yves Saint Laurent. She also appeared on the cover of Elle magazine in Australia, Italy, Portugal, Singapore, Sweden and the United States and made appearances on The Face and Comme des Garçons.
In 2014, Kidd was the face of Jaeger's AW/14 campaign. She was one of three iconic British models who were photographed with their mothers, alongside Jasmine Guinness and Kirsty Hume.
She drove a Maserati and became known for completing the fastest Celebrity Lap in the Suzuki Liana on the Top Gear car show (Series 2 Episode 8 : 6 July 2003). She was later overtaken by Simon Cowell (Series 3 Episode 5 : 9 November 2003) and is now ranked 11th fastest.
On 4 December 2004, Kidd and her co-driver, Fabio Babini, took first place in Bologna, Italy at a Maserati Trofeo Pro-Am event. It was only Kidd's third race. She has also taken part in several rallies of the Gumball 3000.
Kidd's career as a television personality has included participation on Strictly Come Dancing 2008, in which she partnered with professional dancer Ian Waite; they finished in sixth place, and Kidd left the show in a "dance-off" against former model and television presenter Lisa Snowdon. In 2014, Kidd was a finalist in the BBC's annual cookery programme Celebrity Masterchef; she lost the championship to actor Sophie Thompson. In 2015 she appeared in series 2 of The Jump, where she was sixth to be eliminated. In 2015 Kidd appeared as one of the hosts of the Channel 5 automotive show The Classic Car Show with co-host Quentin Willson.
In the summer of 2015, Kidd was tipped to become Chris Evans's co-host on the revamped Top Gear following Jeremy Clarkson's exit. However she ruled herself out of the job stating that she wanted some time out of the limelight.
Kidd and her father are producers of the musical Yarico, a tale of romance and slavery in Barbados, based on the 17th-century operetta Yarico and Inkle.
Kidd's other hobbies include polo, golf and horse riding.
Following a year long romance and engagement, Kidd married Internet entrepreneur Aidan Butler on 10 September 2005 at St Peter's Church, Twineham, West Sussex. The couple split up after 18 months of marriage.
Kidd's son by her partner Andrea Vianini, an Argentinian polo player, was born on 5 September 2011. Kidd and Vianini split in the summer of 2013. Kidd subsequently married David Blakeley, a former British Army captain and author in August 2014. The couple split in January 2015, after four months of marriage and their divorce was fast tracked through court by 1 May 2015.