Showbiz
Rex Features
The actress told US chatshow host Oprah Winfrey that she gave the money to the UN's World Food Programme.
The agency has launched a $3 billion global campaign to feed 59 million schoolchildren in developing countries for a year.
Barrymore, a WFP ambassador, said: "I'm able to make this incredible donation - this has changed my life."
Her friend and production partner Nancy Junvonen recently spoke out in support of the star's romance with actor Justin Long.
More: Drew Barrymore, Showbiz
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