Putting their money where their mouths are! In addition to walking the red carpet and living the glamorous life, these celebrities, including Angelina Jolie, Lauren Conrad, and Matt Damon, are working hard to make the world a better place. Read up on their charities!
"Bringing awareness to women's and children's cancers is very important to me," the 2008 Olympic gold medal-winning gymnast tells Us of supporting Cancer.net, a resource for patients and families caring for someone affected by the disease. "I hope I encourage patients and families to never give up."