Kellan Lutz
The Twilight actor's PETA ad aims to get more people to save animal lives by adopting stray dogs—and who can argue with that?
Sheryl Crow & the Dalai Lama
The singer and the spiritual leader pose together after taking part in an L.A. event on behalf of Whole Child International, an organization designed to improve the quality of care in orphanages around the world.
Nicole Richie & Joel Madden
Harlow and Sparrow's parents are setting a good example for their kids as they help 7-Eleven launch the Cup With a Cause campaign in L.A. The program gives people a chance to buy reusable coffee cups designed by famous folks, with the money raised going toward each celebrity's charity of choice.
Charlize Theron
Proving she's more than just a pretty face, the actress travels to South Africa to help distribute more than 10,000 pairs of shoes to children in need as part of the collaborative efforts between the Oscar winner's Charlize Theron Africa Outreach Project and TOMS Shoes.
Mario Lopez
The actor wears his heart on his sleeve chest, supporting Tide's Loads of Hope campaign, with profits from the sale of T-shirts going to families in the U.S. affected by disaster.
Harrison Ford & Arnold Schwarzenegger
The governator honors the actor's five-year chairmanship of the philanthropic EAA Young Eagles, which uses aviation to inspire and educate youth. Succeeding the amateur aviator as cochairs are Miracle on the Hudson pilots Chesley "Sully" Sullenberger and Jeff Skiles.
Angelina Jolie
The actress, activist and United Nations Goodwill Ambassador visited Washington, D.C., to lend support on World Refugee Day.
Rob Pattinson & Sharon Stone
The stars provide some good-looking moral support at an amfAR event during the 2009 Cannes Film Festival.
Michael J. Fox
The beloved actor has become a major force in the push to find a cure for Parkinson's disease.
Reese Witherspoon
The actress looks dynamite at the fifth anniversary party for the Avon Foundation Breast Center in San Francisco.
Sheryl Crow, Jennifer Aniston & Courteney Cox
Surrounding OmniPeace's Mary Fanaro, these talented women meet up for a night devoted to ending violence against women in the Congo.
Christina Aguilera
The singer lends her impressive pipes to the fight against world hunger with the website FromHungertoHope.com.
Will Smith & Jada Pinkett Smith
The husband and wife team kicked off a birthday concert for Nelson Mandela's 90th birthday party in 2008.
Nancy Pelosi & Brad Pitt
Pitt gets face time with the House speaker to talk about creating affordable housing for low-income residents of New Orleans' Ninth Ward.
Denis Leary
Though he's famously an "a--hole" in his song, the Resue Me star's Leary Firefighter Foundation has helped out in Massachusetts, New Orleans and New York City, where it funded the Big Apple's only fire simulator.
Ben Affleck & Matt Damon
Why are these guys so happy? Because they're in Las Vegas for the Ante Up for Africa Poker Tournament. Cards and charity go really well together.