Christina Aguilera
The singer shoots a PSA on behalf of the fight against world hunger. The spot will be be shown in KFC, Pizza Hut and Taco Bell restaurants beginning this fall.
Justin Bieber
The Biebs teams up with Pencils of Promise to help raise money for schools in need. The top fundraiser wins a visit from Justin himself!
Eva Longoria
The Desperate Housewife goes to Washington to voice her support for the Farmer Worker Health Bill.
Jeff Bridges
The Oscar winner and national spokesman for the No Kid Hungry campaign visited Barcroft Elementary in Arlington, Va., to kick off a new public-private partnership in the state to ensure that children from low-income families benefit from federal nutrition programs at school.
Kelly Clarkson
The singer hosted a benefit concert for the Boys & Girls Clubs of America in New York City.
Nicki Minaj
The Pink Friday rapper turned "Principal for the Day" surprised students at Chicago's Collins Academy High School where she, along with the Get Schooled Foundation, presented three exemplary students with $10,000 college scholarships as part of the Get MotivatED Challenge.
Jack Black
The Kung Fu Panda 2 star took time out to deliver a mesmerizing a capella performance at the Save King Dave benefit, a grassroots event featuring bands, art and food that raised nearly $20,000 for cancer treatments to help chess teacher/good guy Dave Melrose (seen here). Get more info.
Kenny Chesney
The country star will continue with his May 25 concert in Tuscaloosa, Ala., as scheduled, and he and his team are donating all fees and profits from the show to Give Tuscaloosa, which helps aid disaster relief for the tornado-stricken area.
Camille Grammer & Taylor Armstrong
The ladies of Beverly Hills Housewives, with families in tow, attended the Lollipop Theater Network's Annual Game Day Event in L.A., a fundraiser that helps bring movies currently playing in theaters to children confined to hospitals around the country due to illness.
Hugh Jackman
The hunky actor lends his gorgeous mug to help Global Poverty Project, filming a PSA for the organization for which he serves as board member.
Nate Berkus, Jessica Alba, Dr. Oz, Jessica Biel & Jimmy Fallon
The photogenic crew takes part in the 14th Annual EIF Revlon Run/Walk for Women to raise funds for breast and ovarian cancer research.
David Spade
The funnyman shows off his charitable side by donating $200,000 to the American Red Cross for Disaster Relief to help those affected by the recent deadly tornado outbreak in the U.S.
Ruby Gettinger & Alison Sweeney
The Style Network reality star and the Biggest Loser host team up for Fight With Style: Healthy Moms + Healthy Kids, a forum addressing the need to fight childhood obesity.
Gwen Stefani
The singer, whose clothing line Harajuku Lovers was inspired by her affection for the Japanese culture, donated $1 million to Save the Children's Japan Earthquake-Tsunami Children in Emergency Fund. Gwen is also creating a charity auction where fans can bid on the chance to join her at a special fundraiser in L.A. as well as selling limited edition T-shirts to help benefit the relief effort in Japan.
Demi Lovato
The actress finds a way to encourage folks to help those suffering in the wake of the Japan disaster. But she's certainly not the only one.
Will Ferrell
Snowballs in L.A.?! The always funny Anchorman star doesn't miss a chance to goof off while promoting his very own coffee cup for 7-Eleven's Coffee Cup With a Cause program benefitting the Cancer for College organization.
Kris Jenner
For the Keeping Up With the Kardashians matriarch, life is, indeed, a Cabaret, old chum. Jenner leads the musical's ensemble cast as Fräulein Kost in a benefit performance (seen here in rehearsal) of Woodland Hills' Class Act Theatre on October 22 and 23. The organization provides performing arts programs to underpriviledged children.
AnnaLynne McCord
The 90210 star is looking to help people in every zip code. The actress is seen here modeling high heel pumps designed by Fergie—one of more than 100,000 pairs of shoes from over 100 brands being sold by the Fashion Footwear Association of New York on QVC on October 15 to raise money for breast cancer research and education institutions.
Ted Turner
Perhaps better known for living a wild life, the billionaire media mogul now focuses on preserving wildlife through his Turner Foundation. Which is why the Environmental Media Association is having Natalie Portman and Jane Fonda present Turner with an ecology award at a private ceremony October 16. Kudos!
Pamela Anderson
The long time PETA supporter adopted two Chihuahua mixes while on a trip to New Orleans. The blond bombshell visited the Gulf, bringing awareness to the countless abandoned animals affected by the BP oil spill.
Colbie Caillat
The singer and '09 Grammy nominee collaborated with Pennyroyal Silver to design a limited-edition pendant, with proceeds benefitting the Surfrider Foundation's efforts to save wildlife affected by the Gulf of Mexico oil spill.
Scarlett Johansson
Marriage advice from Madonna? No, thanks. Healthy body advice from Scarlett? Now there's a match. The actress sent a letter to Congress asking them to support the Healthy School Meals Act, a bill that would require obesity-fighting lunches be made available to kids of all income levels.
Antonio Banderas
Proving you can look good and do good, the Spanish heartthrob is the latest A-lister to become a U.N. Goodwill Ambassador, choosing to focus his attentions on the problem of global poverty.
Michael J. Fox
The future looks bright for Parkinson's patients thanks to Michael J. Fox. The folks behind the Nobel Prize for Medicine, Sweden's Karolinska Institute, bestowed an honorary doctorate on the Back to the Future star for his work raising funds and awareness to find a cure for Parkinson's diease through his Michael J. Fox Foundation.