40 Pictures of Charitable Celebrities Giving Back

Christina served food to children in Ecuador while on a humanitarian trip with the United Nations World Food Programme in September 2015.

In September 2015, Orlando paid a visit to Syrian refugees during a UNICEF trip.

David Beckham played soccer with schoolchildren during a February 2013 visit on behalf of UNICEF to meet with survivors from the 2013 typhoon that devastated the region.

Anne Hathaway served food to children at the Kids Cafe in New York's Harlem neighborhood during the holidays in December 2008.

Angelina visited a Syrian refugee camp in Zahle, Lebanon, in February 2014. She traveled on behalf of the United Nations and met with refugees who had been displaced due to the Syrian civil war.

In March 2010, Sienna Miller took a philanthropic trip to Haiti as an ambassador for International Medical Corps.

Gisele Bündchen planted seeds with 80 kids in São Paolo, Brazil, in September 2011.

Chef Ming Tsai and actor Matt Damon joked together during the Family Reach Foundation's Cooking Live event in September 2012.

In August 2010, Sandra Bullock cut the ceremonial ribbon at New Orleans's Warren Easton Charter High School at the campus health clinic she helped fund.

In October 2011, the supermodel visited an orphanage in Moscow as part of her commitment to Northern Crown Children's Charity.

Nicole Richie helped restore the CITYarts Mosaic Peace Wall in NYC at an event for DoSomething.org in July 2012.

Beyoncé surprised students at a public school in New York's Harlem neighborhood as part of Michelle Obama's Let's Move campaign in May 2011.

Miranda Kerr popped up in her native Sydney, Australia, to promote the Kids Helpline in February 2013.

Reese and Jennifer teamed up for the Stand Up to Cancer fundraising event in September 2014.

Jennifer Garner gardened for a good cause with kids in support of Save the Children in June 2011.

Halle Berry hosted the Revlon Run/Walk For Woman in LA in May 2013 — the actress has supported the charity effort as a brand ambassador since 1996.

Usher posed with staff and children at the Be the Change event in Washington DC back in January 2009.

Leonardo DiCaprio joined the People's Climate March in NYC in September 2014.

In October 2010, Matthew McConaughey hit the pavement with dozens of runners in LA taking part in his own charity event with J.K. Livin, which encourages youth to lead active lifestyles.

Avon spokesperson Zoe Saldana visited the Red Cross in the Dominican Republic in February 2010.

The Kardashian sisters teamed up with Babies"R"Us to surprise military moms-to-be with gifts — including items from their Kardashian Kids collection — at a New Jersey event in July 2014.

Cameron got down and dirty with volunteers while building a fence in Boston in September 2009.

Taylor met up with young ambassadors from Save the Children for a Christmas event in London in November 2012.

Tom Brady hosted a football challenge for Best Buddies International in Boston back in June 2012.

In November 2013, Prince William participated in St Basil's youth homeless charity project in Birmingham, London.