Heather, Lady McCartney (born January 12, 1968 in Washington, Sunderland, England), usually known as Heather Mills or Heather Mills McCartney, is a campaigner on behalf of several causes, including amputees and the curtailment of land mines and animal rights. Her early career was as a model and, she is the wife of former Beatle Sir Paul McCartney; the couple announced their separation in May 2006.

Her personal life prior to her marriage to Paul McCartney was fairly colourful: homelessness (though it has been alleged that she concocted that story to win sympathy), traveling abroad to perform in pornographic materials, one previous marriage (to computer sales director Alfie Karmal), two ectopic pregnancies and two fiancés.

She admitted that in 1988, while aged nineteen, she took part in a photoshoot with a male model where they performed simulated sexual acts. The photos were published in a German book titled Die Freuden Der Liebe (The Joys of Love). When the media reported on the photos in 2006, her representatives insisted that the book was not pornography because it was a sexual advice manual but the pictures are not accompanied by any words. The male model in the book claims it was presented to him as a sex manual, and he was surpised at the eventual content. Former friends have been quoted saying that she had bragged about the book and that during this period in her life she travelled abroad frequently to model for pornographic materials that she thought would not be seen in England. Similar rumours have circulated at different times that for several years she had been an international prostitute who serviced a wealthy middle eastern clientelle, including arms dealer Adnan Khashoggi and Harrods owner Mohamed Al Fayed, all of which she continues vehemently to deny. The most detailed revelations about this period yet made were published in the News of the World in June 2006.

In 1990, she moved to what was then northern Yugoslavia (now Slovenia), where she saw the unfolding civil war first-hand. Over the following two years she modelled to raise funds for refugees of the war, and commuted between Slovenia, Croatia, Bosnia and England.

In August 1993, she was hit by a police motorcycle while crossing the road near London's Kensington Palace; her injuries included crushed ribs, a punctured lung, a metal plate needing to be put in her pelvis and the amputation of her left leg below the knee. Mills has a prosthetic leg, notably taking it off and showing it to U.S. talk show host Larry King during his interview with her in October, 2002. She later sold her story of recovery following the accident to a British tabloid, with details of how she and her boyfriend made love in her hospital bed.

Following the accident she arranged for unwanted prostheses to be sent from the United Kingdom to the war-torn former Yugoslavia.

Heather Mills married Paul McCartney on 11 June 2002, four years after his first wife Linda McCartney died of cancer. Their wedding was an elaborate ceremony at Castle Leslie (once home of Shane Leslie) in the village of Glaslough in rural Ireland. On 17 May 2006 it was officially announced, via the couple's websites that she was to separate from her husband. Media speculation in the weeks prior to this had been intense. She has a new book, Life Balance, which was published on 25 May 2006 about health, happiness and 'unlocking the inner you'. In the London newspaper the Evening Standard on 18 May 2006, Mills-McCartney told of the hurt she felt over claims she'd only married Sir Paul for his money, and she said 'I am no gold digger' and that the allegations were worse than 'losing my leg'. The Daily Telegraph was one of a number of British newspapers to suggest that if the couple did eventually divorce, it could lead to the UK's biggest ever divorce settlement, some estimating she could receive £200 million (one-quarter of Paul McCartney's wealth). Other estimates have suggested she will receive in the range of £25 million.