Some of Hollywood's most famous faces -- including Natalie Portman, Dave Matthews and Mariska Hargitay -- joined chimpanzee expert Jane Goodall to celebrate the premiere of Disneynature's latest documentary "Chimpanzee."
"Chimpanzee," narrated by Tim Allen, follows the story of Oscar, a young chimpanzee living in the Tai Forest National Park in the Ivory Coast. During the film, a rival band of chimpanzees confronts Oscar and his family, separating them.
Left to fend for himself, Oscar meets Freddy, an alpha-male chimp that becomes an adoptive father. During the film's opening week, Disney will donate 20 cents to the Jane Goodall Institute for every ticket sold.
Click through the gallery below to see the stars and their families celebrate "Chimpanzee" with Goodall.
"Chimpanzee" hits theaters on Earth Day, April 20.
RELATED ON HUFFPOST:
HuffPost Entertainment is your one-stop shop for celebrity news, hilarious late-night bits, industry and awards coverage and more — sent right to your inbox six days a week. Learn more