The fundraiser, also known as SU2C, drew big names like Renee Zellweger. (Handout / Getty Images)
Breast cancer survivor Maura Tierney returns to television this fall as a deputy bureau chief in the new ABC series “The Whole Truth.” (Frederick M. Brown / Getty Images)
Anne Heche arrives at the cancer benefit. (Frederick M. Brown / Getty Images)
Jennifer Grey, who recently joined “Dancing With the Stars,” poses for photographers. (Frederick M. Brown / Getty Images)
Celebrities like Elizabeth Banks and Tony Hawk tweeted from the Stand Up to Cancer event. (Frederick M. Brown / Getty Images)
Kristen Bell joined stars like Dakota Fanning and Zac Efron for a recent Stand Up to Cancer PSA. (Frederick M. Brown / Getty Images)
Cheryl Hines poses in her Stand Up to Cancer long-sleeved t-shirt. (Frederick M. Brown / Getty Images)
Emily Deschanel, pictured, and her “Bones” costar David Boreanaz were among the stars on the red carpet. (Frederick M. Brown / Getty Images)
“Desperate Housewives” star Marcia Cross arrives on the scene. (Frederick M. Brown / Getty Images)
TV and radio personality Dr. Drew Pinsky and his wife Susan. (Handout / Getty Images)
David Boreanaz told “Fox & Friends” that he’s lost family members to cancer. (Frederick M. Brown / Getty Images)
Ray Liotta arrives at the telethon. (Handout / Getty Images)
Jaime King was among the young Hollywood stars who participated in a cancer PSA leading up to the event. (Frederick M. Brown / Getty Images)
More than 100 celebrities, including Diane Lane, signed up to participate in the telethon. (Frederick M. Brown / Getty Images)
“Access Hollywood’s” Shaun Robinson poses on the red carpet. (Frederick M. Brown / Getty Images)
“Nanny” Fran Drescher wrote a book about her experience with uterine cancer called “Cancer Schmancer.” (Frederick M. Brown / Getty Images)
Brian Williams and Katie Couric will host the “Stand Up to Cancer” telecast with fellow anchor Diane Sawyer. The benefit will air simultaneously on ABC, CBS, Fox and NBC. (Frederick M. Brown / Getty Images)
Cancer survivor Christina Applegate poses with actress Nia Vardalos. (Frederick M. Brown / Getty Images)
Vanessa Hudgens, who stars in the upcoming films “Beastly” and “Sucker Punch,” arrives at the telethon. (Frederick M. Brown / Getty Images)
Fans of Kelly Osbourne‘s family reality show “The Osbournes” (2002-2005) may remember her mother Sharon’s battle with colon cancer during Season 2. (Frederick M. Brown / Getty Images)
Gabrielle Union sports a Stand Up to Cancer tank top, one of several styles worn on the red carpet. (Frederick M. Brown / Getty Images)
Abigail Breslin, who stars in the 2011 release “Dear Eleanor,” smiles for the camera. (Frederick M. Brown / Getty Images)
Emmy winner Kathryn Joosten of “Desperate Housewives” has talked openly about her battle with lung cancer. (Frederick M. Brown / Getty Images)
Dr. Mehmet Oz, left, of “Dr. Oz” and “The Oprah Winfrey Show” poses with “Community” star Ken Jeong. Few can forget Jeong’s emotional acceptance speech at the 2010 MTV Movie Awards when he thanked his friends for being so supportive while his wife Tran was battling breast cancer. (Frederick M. Brown / Getty Images)
Tatyana Ali, who can be seen in the upcoming thriller “Locker 13,” joined fellow star supporters on the red carpet. (Frederick M. Brown / Getty Images)
“CSI: Miami” star Eva La Rue stops for photographers on the red carpet. (Frederick M. Brown / Getty Images)
“Medium” star Sofia Vassilieva strikes a pose on the Culver City red carpet. (Frederick M. Brown / Getty Images)
“CSI: Crime Scene Investigation” star Marg Helgenberger is also known for her Omaha, Neb., cancer benefit Marg and Alan’s Celebrity Weekend that she hosted for many years with her ex-husband Alan Rosenberg. (Frederick M. Brown / Getty Images)
“Biggest Loser” host Alison Sweeney arrives at the Sony Pictures Studios lot in Culver City. (Frederick M. Brown / Getty Images)
“Private Practice” star Tim Daly on the red carpet. (Frederick M. Brown / Getty Images)
“Saturday Night Live” funnyman Bill Hader was among the famous faces on the red carpet. (Frederick M. Brown / Getty Images)
“Scrubs” star Donald Faison stands up for the cause. (Frederick M. Brown / Getty Images)
Performer Natasha Bedingfield hits the red carpet before heading inside. (Frederick M. Brown / Getty Images)
Newly minted Emmy winner Eric Stonestreet, who stars in “Modern Family,” puts his celebrity to good use. (Frederick M. Brown / Getty Images)
Olivia Munn started her new job at the “Daily Show” over the summer. (Frederick M. Brown / Getty Images)
Marlee Matlin is known for her work with charitable organizations like Easter Seals, the Children Affected by AIDS Foundation and Elizabeth Glaser Pediatric AIDS Foundation. (Frederick M. Brown / Getty Images)
Olympic medalist Apolo Ohno arrives at the Stand Up to Cancer benefit. (Frederick M. Brown / Getty Images)
“Parks and Recreation” star Aubrey Plaza arrives at Sony Pictures Studios. (Frederick M. Brown / Getty Images)
