( CNN ) -- Many celebrities have taken part in the CNN Heroes campaign and attended the annual `` CNN Heroes : An All-Star Tribute '' shows . Here , we reach out to some of them and learn about the ways they 've chosen to get involved and give back . Common Hip-hop artist Common wants to create a supportive community for youths on Chicago 's South Side . The Grammy Award winner started the Common Ground Foundation to help underserved youth develop leadership and life skills . Common 's story | Q & A . Wynonna Judd Country music star Wynonna Judd is a supporter of the Wounded Warrior Project , an organization that helps injured service members and their families . Judd 's story | Q & A . Rainn Wilson Actor Rainn Wilson is dedicated to improving the lives of young people around the world . The star of `` The Office '' works with the Mona Foundation , which supports educational initiatives for children in developing countries . He is also involved with Planting Peace and its program to deworm children in Haiti . Wilson 's story | Q & A . Gary Sinise Actor-director Gary Sinise has touched the lives of thousands of U.S. service members . Sinise often travels overseas to honor and entertain the troops with his Lt. Dan Band , and his Gary Sinise Foundation helps support them when they return home . Sinise 's story | Q & A . Kristin Davis Actress Kristin Davis is an ambassador for Oxfam , an international alliance of 15 organizations striving to find lasting solutions to poverty and injustice . As part of her efforts , Davis advocates for vulnerable women around the world . Davis ' story | Q & A . George Lopez George Lopez is helping to create positive change for underprivileged children , adults and military families . In 2009 , he started The Lopez Foundation , which provides and supports education and health programs for those in need . The group also increases awareness about kidney disease and organ donation . Lopez 's story | Q & A . J.R. Martinez Actor and Iraq war veteran J.R. Martinez is the spokesman for Operation Finally Home , an organization that provides free , custom-built homes for injured veterans . Martinez 's story | Q & A . Lucy Liu Actress Lucy Liu is an ambassador for UNICEF , an organization that gives children the essentials for a safe and healthy childhood . Approximately 21,000 children die every day from preventable causes , according to UNICEF , and its mission is to reduce that number to zero . Liu 's story | Q & A . Nate Berkus Designer and TV host Nate Berkus is a member of the American Red Cross Celebrity Cabinet , which helps to highlight the organization 's initiatives and response efforts . Founded in 1881 , the American Red Cross is part of a worldwide movement that offers humanitarian care to victims of war and natural disasters . Berkus ' story | Q & A . Kristin Chenoweth Actress Kristin Chenoweth started Maddie 's Corner , an organization that supports animals in need . Chenoweth 's story | Q & A .
How have celebrities been affected by CNN Heroes ? We asked them to share with us the causes they 're most passionate about . Many of this year 's celebrities have been involved with CNN Heroes for several years .