1 of 22
Jennifer Garner joins host Kate Beckinsale at the 4th Annual Pink Party gala in Santa Monica, Calif. The event boasted a fashion show and luxury auction benefiting the Women's Cancer Research Institute at Cedars-Sinai Medical Center. "It is a pleasure and a privilege to be part of such an important cause," Beckinsale said.
2 of 22
The Pussycat Dolls proudly wear hot-pink shirts emblazoned with the pink ribbon – the symbol of breast cancer – in Melbourne, Australia, where they took the stage for a charity concert aiding the National Breast Cancer Foundation.
3 of 22
Proudly showing off the charity shirt she designed, Mel B. helps launch the Web site PoseForTheCure.com, where her shirt and other items from designers like Gucci, Dolce amp Gabbana and more can be purchased. A portion of the proceeds goes to the Susan G. Komen for the Cure foundation.
4 of 22
Taking the stage for a good cause, the Jonas Brothers perform to a sold-out crowd at the Gibson Amphitheater in L.A. during the Concert for Hope, benefiting cancer research and treatment programs at City of Hope, a Duarte, Calif., cancer hospital. In addition to the $1.2 million raised at the event, the Jonas Brothers and their Change for the Children Foundation pledged an additional $250,000.
5 of 22
CONCERT FOR A CAUSE
Gabrielle Union heads into the Think Pink Rocks concert, a charity show raising money to fight breast cancer. Queen Latifah, Akon and more stars supported the event, hosted by SRC Records.
6 of 22
HOPELESSLY DEVOTED TO THE FIGHT
A breast cancer survivor herself, original "Sandy" Olivia Newton-John takes to the stage during the curtain call at Broadway's Grease to kick off Breast Cancer Awareness Month alongside the show's current stars, Derek Keeling ("Danny") and Ashley Spencer ("Sandy").
7 of 22
While girlfriend Samantha Ronson deejays, Lindsay Lohan hits the red carpet at the Saks Fifth Avenue Key to the Cure launch party for EIF's Women's Cancer Research Fund. Saks pledged to donate up to $500,000 to the EIF fund.
8 of 22
Sheryl Crow, Christina Applegate and Melissa Etheridge proudly show that they're survivors at Stand Up to Cancer, a multi-network charity event that aired Sept. 5. Crow beat breast cancer in 2005, Applegate underwent a double mastectomy after being diagnosed with breast cancer this year, and Etheridge recovered from the disease in 2005, famously performing bald at the Grammy Awards.
9 of 22
Tori Spelling puts her artistic skills to the test, decorating pink ducks to benefit the Munchkin's Project Pink Breast Cancer Awareness Campaign in L.A. "It's very important, especially now that I'm a mom ... [to] bring awareness to women so they can get checked," Spelling told PEOPLE at another breast cancer event in September.
10 of 22
As the Avon Global Ambassador, Reese Witherspoon traveled to Japan in June, taking part in a traditional Japanese tea ceremony, where she met women who are breast cancer survivors. "I feel a great responsibility in my own life to give back to society," the actress has said.
11 of 22
Stunning in a glittering red Isaac Mizrahi gown, Good Morning America co-anchor Robin Roberts strutted her stuff for the designer's studio fashion show. As part of GMA's "I Dare You" segments, Roberts's colleagues challenged her to walk the catwalk. "When I first heard about their dare I was like 'No way!' because I have felt anything but beautiful going through this battle with cancer," Roberts tells PEOPLE. "And then I thought, 'Heck yeah!' What better way to get my mojo back?"
12 of 22
RAISING HER VOICE
Marcia Cross put to good use her time off during the Hollywood writers' strike. The Desperate Housewife headed to Washington, D.C., in January to lobby Congress to pass legislation that would require a 48-hour stay in the hospital post-mastectomy. "It's not like we're asking for a week in the hospital. It's 48 hours," Cross said, presenting 20 million signatures in support of the legislation gathered from mylifetime.com. "These women have major surgery and are sent right home. Can you imagine? I mean, have you seen a mastectomy scar?"
13 of 22
To promote B.O.O.B.S., a book about survivors of breast cancer, Tyra Banks took to the streets, burning bras that don't fit for an episode of her talk show.
14 of 22
Shortly after giving birth to daughter Nahla Ariela, Halle Berry suited up for the 15th Revlon Run/Walk, held a day before Mother's Day in L.A., to raise money for cancer charities. At the event, she spoke about her doctor, whose wife was battling breast cancer while she was pregnant. "His resilience and his wife's resilience just reminded me of the courage that it takes to survive this disease," she said. "There are so many survivors out there right now, I want to congratulate you."
15 of 22
TAKING A STAND
The official ambassador for the Susan F. Komen for the Cure Foundation – and breast cancer survivor – Cynthia Nixon, took the microphone at the annual Race for the Cure, held in New York's Central Park in September. On the Komen Web site, Nixon writes, "Talk with your doctor, make healthy lifestyle choices and most importantly, know your body – as that can make all the difference in the world."
16 of 22
Gwyneth Paltrow, Sir Elton John and Elizabeth Hurley proudly wore the cause's signature color – pink! – at the Breast Cancer Research Foundation's Hottest Pink Party ever, held at New York's Waldorf-Astoria in April. John performed at the event, which raised $5 million for breast cancer research.
17 of 22
Calvin Klein spokesmodel and actress Eva Mendes makes a stylish appearance at the Sydney launch of "30 Days of Fashion and Beauty," which raised funds for Fashion Targets Breast Cancer, an awareness group founded by the Council of Fashion Designers of America.
18 of 22
Next up at bat in the battle against breast cancer: Sopranos stars James Gandolfini and Steven Schirripa, who autographed baseball bats and mingled with auction winners from charityfolks.com to benefit the Carol M. Baldwin Breast Cancer Research fund in N.Y.C. in June.
19 of 22
Heidi Klum poses with a cuddly friend at a Cologne, Germany, press conference announcing the joint venture by perfume chain Douglas and DKMS Life to provide free cosmetic workshops for cancer-stricken women. The sessions show women how to use makeup to cover the effects of chemotherapy and radiation.
20 of 22
SINGING LOUD AND PROUD
A plethora of divas – Leona Lewis, Keyshia Cole, Carrie Underwood, Mariah Carey, Mary J. Blige, Beyoncé Knowles, Miley Cyrus and more – take the stage together during Fashion Rocks in New York City to perform "Just Stand Up," a charity single benefiting the Stand Up to Cancer fundraising drive.
21 of 22
Kelly Ripa joins forces with appliance company Electrolux to introduce its new line of kitchen appliances, the proceeds of which benefit the Ovarian Cancer Research Foundation. The talk-show host also helms an annual fund-raiser for the foundation in the Hamptons.
22 of 22
RUN FOR IT
A longtime supporter of the Padres Contra El Cancer – an organization helping economically disadvantaged, Spanish-speaking children and families – Eva Longoria Parker suits up for the inaugural Stand for Hope! 5K Walk/Run in Los Angeles, a charity race benefiting the center. "It's been a longtime dream for us to get this started," she said at the event, which is "put on by the community, for the community."
Angelina Jolie Glitters in Gold, Plus Keira Knightley, Pharrell & More
Quavo, Justin Bieber, Jamie Foxx and More Stars Hit Up All-Star Weekend in L.A. — See the Pics