Grey's Anatomy star Patrick Dempsey raised more than $1.1 million for cancer over the weekend when 4,000 people biked, walked, or ran in races through his hometown of Lewiston, Maine. Proceeds from the second annual Dempsey Challenge will benefit the Patrick Dempsey Center for Cancer Hope and Healing at Central Maine Medical Center, built in Lewiston to honor his mother.
Here are 10 times celebrities harnessed their star power to help others – or just make people smile in 2015.
Actor Sacha Baron Cohen and actress wife Isla Fisher have given a million dollar Christmas gift to children who have nothing.
Robin Williams' son Zak says he could have coasted through life, but wanted to help others like his famous father did. Now he helps those who need it most.
The action movie star auctioned off his collection of memorabilia from movies like "Rocky" and "Rambo" to raise money for charity.
When her mother told a teen battling cancer she had a visitor, the girl had no idea she'd spend the afternoon with a superstar.
A personal note from the queen brought a man to tears after taking over his grandfather's Christmas tradition.
The star of "Spartacus" used his 99th birthday to unveil plans for the Kirk Douglas Care Pavilion which will be able to treat up to 80 Alzheimer's patients.
A three-time Oscar nominee was so moved by a Syrian refugee's story, he's raised $400,000 to help his family come to America.
His dad, whose favorite show was Seinfeld, was dying of cancer. What better gift than getting cast members to send funny videos of themselves in character.
Barack Obama, his two daughters, and Michelle switched on the National Christmas Tree with some help from actress Reese Witherspoon and the musical guests. Miss Piggy also made a special appearance reading "The Night Before Christmas" with Michelle Obama. Watch some highlights below…
Dwayne "The Rock" Johnson donates $1,500 to help a shelter dog named after him get live-saving surgery.
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