Bianca met Mick Jagger at a party after a Rolling Stones concert in France in September 1970. On 12 May 1971, while she was four months pregnant, the couple married in a Roman Catholic ceremony in Saint-Tropez, France, and she became his first and only wife. The couple’s only child, a daughter named Jade, was born on 21 October 1971, in Paris, France. In May 1978, she filed for divorce on the grounds of his adultery with model Jerry Hall. Bianca later said “My marriage ended on my wedding day.”

In early 1979, Jagger visited Nicaragua with an International Red Cross delegation and was shocked by the brutality and oppression that the Somoza regime carried out there. This persuaded her to commit herself to the issues of justice and human rights.

In 1981, Jagger was part of a US congressional delegation stationed at a UN refugee camp in Honduras. At one point during her official visit, the entire staff saw about 40 captured refugees marched away at gunpoint towards El Salvador by a death squad. Armed with nothing but cameras to document the raid, Jagger and the delegation trailed the squad along a river towards the Honduran-Salvadoran border. When both groups were within auditory range of each other, Jagger and the staff shouted at the M16 rifle equipped raiders, “You will have to kill us all!” The squad considered the situation, approached the group, relieved them of their cameras, and released the cache of captives. A transformation had thus begun for Jagger. In subsequent interviews, Jagger has recounted this incident as “a turning point in my life.”

In March 2002, Jagger travelled to Afghanistan with a delegation of fourteen women, organised by Global Exchange to support Afghan women’s projects. On 16 December 2003, Jagger was nominated Council of Europe Goodwill Ambassador.

She was also a member of the Twentieth Century Task Force to Apprehend War Criminals, and a trustee of the Amazon Charitable Trust. She gave a reading at the start of the memorial service in London’s Westminster Cathedral, which was timed to coincide with the funeral in Brazil of Brazilian Jean Charles de Menezes, who was shot eight times on a tube-train after being mistaken for a suicide bomber in London. In March 2007, she became involved with Sarah Teather and the campaign to close Guantanamo Bay.

From 2007 to 2009, she was Chair of the World Future Council. On 7 July 2007, Jagger presented at the German leg of Live Earth in Hamburg. In July 2008, she was a signatory to a petition to the Catholic bishops of England and Wales to allow the wider celebration of the traditional Latin Mass. In January 2009, Jagger addressed some 12,000 people who rallied in Trafalgar Square in protest against an Israeli offensive in the Gaza several days earlier.

On 8 October 2010, she spoke at the Association for the Study of Peak Oil and Gas (ASPO) 2010 world conference on moving beyond petroleum and “Crimes against Present and Future Generations”.

Jagger caused a minor controversy in May 2012 when she took flash photographs during a performance of Philip Glass’ Einstein on the Beach at the Barbican in London.

In June 2012, Jagger, along with the International Union for Conservation of Nature and Airbus launched an online campaign called Plant a Pledge initiative, which aims to restore 150 million hectares of forest around the world by 2020.

On 21 November 2013, Jagger delivered the prestigious 12th annual Longford Lecture titled “Ending Violence Against Women and Girls, and the Culture of Impunity: achieving the missing Millennium Development Goal target”, chaired by Jon Snow.

Jagger has two granddaughters from her daughter Jade, Assisi Lola (born in 1992) and Amba Isis (born in 1996) and a grandson born in 2014. She became a great-grandmother in 2014 through her granddaughter Assisi.