Isabel Lucas for Earth Hour 2012

Isabel Lucas' IWIYW challenge for WWF's Earth Hour 2012 Watch

The QN2A Project: Let's Turn Questions Into Answers

Stand Up To Cancer (SU2C), CTCA and SU2C ambassador James Denton put the spotlight on the Big Questions and show how you can help turn them into answers. Watch

90210's Raj & Ivy Want U 2 Be The Match

The CW’s 90120 Gillian Zinser and Manish Dayal talk about the need for a younger and more diverse Be The Match Registry and how easy it is to join and donate marrow. Watch

Alec Baldwin: Boycott Circuses That Use Animals

Actor and animal defender Alec Baldwin describes the sad plight of elephants who are torn from their families and forced to perform grueling tricks in the circus. Watch

Ricky Gervais Saves Animals From Cosmetics Testing

Ricky Gervais launches Cruelty Free International, a global campaign to end cosmetic tests on animals. Watch

George Clooney Witnesses War Crimes in Sudan's Nuba Mountains

WARNING This video contains graphic content that some viewers may find disturbing. Watch

Ke$ha Speaking Out For Seals

Star singer and performer Ke$ha is working with Humane Society International to stop the killing of baby seals in Canada. Find seal-friendly restaurants and grocery stores with Protect Seals, a free app for iPhone and iPad. Go to humanesociety.org/sealapp. Watch

Miranda Kerr's Earth Hour 2012 Challenge

International supermodel and Earth Hour global ambassador Miranda Kerr has pledged to conduct a free yoga class if 500 of her fans upload their own “I Will If You Will” challenge to www.youtube.com/earthhour. Watch

Kelly Clarkson: Battle for the Bands

Kelly Clarkson wants to help you save music education with DoSomething.org and the VH1 Save The Music Foundation. Watch

Michael Douglas Financial Fraud PSA For The FBI

Michael Douglas says that greed is bad in this PSA for the FBI. Watch

The Trevor Project PSA with Daniel Radcliffe

Daniel Radcliffe's second PSA for The Trevor Project. Watch

Grand Opening of Best Friends Adoption and Spay/Neuter Center in Los Angeles

Stars such as Rachelle Lefevre, Hilary Swank, Eric Roberts, Lisa Edelstein, Kristin Bauer and Amy Smartattend the grand opening of the Best Friends Animal Society's new Pet Adoption and Spay/Neuter Center in Mission Hills. Watch

JLS - Proud

Music video by JLS performing Proud for Sport Relief. Watch

Stella McCartney Takes On The Leather Trade

In this video from PETA, find out why fashion designer Stella McCartney chooses to leave leather out of her collections. Watch

Pete Wentz's MASScanvas Challenge For Invisble Children

Pete Wentz of Fall Out Boy is teaming up with online community MASScanvas, encouraging fans to design and illustrate “POWER” themed T-shirts. A portion of the sales of winning T-shirts will benefit Invisible Children. Watch

Martha Stewart Speaks Out About Cruelty to Farm Animals

During Farm Sanctuary's 25th Anniversary year, Martha Stewart included President and Co-Founder Gene Baur on her Vegan Show. She also recorded this powerful message about the cruelty of factory farming. Watch

Muscle Dreams endorsed by Kenneth Branagh

Kenneth Branagh (film director & actor) gives a heart-felt endorsement of Muscle Dreams, amazing once-in-a-lifetime experiences for children and young people suffering with the muscle wasting disease Muscular Dystrophy. Kenneth Branagh is a Patron of The Muscle Help Foundation. Watch

Reach Out Worldwide 2 Year Anniversary

Paul Walker celebrates the 2 year anniversary of his charity REACH OUT Worldwide, and reviews the difference it has been making. Watch

Adrian Paul - The PEACE Fund - Charity message

Adrian Paul's charity message for The PEACE Fund. Watch

Demi Lovato: 2012 Teens for Jeans

DoSomething.org, Demi Lovato and Aeropostale have teamed up for another year of fighting teen homelessness. Watch