French President Francois Hollande (L) greets singer Bono (C) and Bill Gates, co-founder of the Bill and Melinda Gates Foundation, as they arrive at the Elysee Palace in Paris on 10 October. Reuters

Actor George Clooney is one of the world’s leading celebrity contributor to charity. In this file photo taken on 28 April 2012, he attends the White House Correspondents Association Dinner in Washington, DC. AFP

This file photo from 15 September 2012, shows Angelina Jolie visiting families previously displaced by the conflict in Iraq and now returning owing to the conflict in Syria. AFP PHOTO/HO/UNHCR/JASON TANNER

In this 1 September, 2012 file photo actor Jackie Chan (right) during the 2012 BAZAAR Stars Charity Night in Beijing where 400 Chinese entrepreneurs helped raise more than 40 million yuan for charity. AFP

Musician Elton John (right) at the podium next to his partner David Furnish at his Aids Foundation charity event “An Enduring Vision 2012” in New York on 15 October 2012. Reuters

Singer Beyonce is associated with the annual “Carousel of Hope” Benefit for Childhood Diabetes program. In this 23 October 2004 file photo, she arrives at the 16th annual event in Beverly Hills, Calif. AP

In this 23 May, 2012 file photo, Brad Pitt poses for the film “Killing Them Softly,” during the 65th Film Festival in Cannes, France. Pitt is one of the world’s leading celebrity contributor’s to charity. AP

Singer George Michael performs during a charity gala for the benefit of Sidaction, which aims to collect money for the struggle against AIDS virus, at the Opera Garnier in Paris, on 9 September, 2012. AFP

Elizabeth Hurley during the 20th Anniversary of the Estee Lauder Companies’ Breast Cancer Awareness Campaign on 10 October 2012 in Paris. Every year, Hurley dresses in pink to mark the Breast Cancer Awareness Month. AFP

Tom Hanks attends The Elie Wiesel Foundation For Humanity’s Arts for Humanity Gala on 17 October 2012 in New York. AP