From PEOPLE Magazine Click to enlarge
Eva LONGORIA

FOUNDER: EVA LONGORIA FOUNDATION

The star's nonprofit provides entrepreneurial support, career tools and education for Latinas. "We want to give them the resources to succeed," she says.

To learn more, go to: evalongoriafoundation.org

Nicole KIDMAN

AMBASSADOR: UN WOMEN

After the 2010 earthquake, the actress says, she met a woman in Haiti who taught kids in her destroyed home. "Women like her, who face enormous obstacles yet go on to help others, are my heroes."

To learn more, go to: unwomen.org

Katharine MCPHEE

ADVOCATE: MALARIA NO MORE

The Smash actress distributed mosquito nets this spring in areas of Ghana and Burkina Faso affected by the disease. The trip, she says, "left me more motivated to help the children of Africa."

To learn more, go to: malarianomore.org

David BECKHAM

GOODWILL AMBASSADOR: UNICEF

Involved with the children's rights organization since his days with Britain's Manchester United team, the soccer star says, "I'm incredibly fortunate to be in a position to help others, and it's something I'm passionate about. It was a visit to a center for abused children in Thailand that really left a mark on me. It just isn't right that a child can be deprived of food, water or basic care."

To learn more, go to: unicef.org

Kate MIDDLETON

PATRON: EAST ANGLIA'S CHILDREN'S HOSPICES

When the Duchess of Cambridge gave a speech at a March event for East Anglia's Children's Hospices, she noted that when she first visited the hospice, she had a "preconceived idea as to what to expect. Far from being a clinical, depressing place for sick children, it was a home ... a happy place of stability, support and care. It was a place of fun."

To learn more, go to: each.org.uk

Jillian MICHAELS

ADVOCATE: ALL BLESSINGS

During the process of adopting a baby, the trainer connected with an agency that brought "deeper meaning to my life," she says. "Other than being a parent, I can't imagine anything more fulfilling."

To learn more, go to: allblessings.org