NEW YORK, March 3 (Reuters) - U.S. actress Drew Barrymore donated $1 million of her own money on Monday to the World Food Programme (WFP) that the U.N. agency said would be used to feed thousands of schoolchildren in Kenya.

Barrymore, 33, a WFP ambassador against hunger, announced her pledge on The Oprah Winfrey Show to kick off the agency's $3 billion "Fill the Cup" campaign that aims to feed 59 million hungry school children in developing countries for a year.

WFP hopes the United States will be able to donate enough money to feed 10 million of those children.

"I have seen with my own eyes what a difference a simple cup of nutritious porridge can make in a child's life," said the "Charlie's Angels" star, who has traveled to Kenya twice in the past two years for WFP.

"It helps them learn, stay healthy and sets them on track for a bright future. I urge everyone -- everywhere -- to help WFP 'Fill the Cup' for hungry children, and make hunger history," she said in a statement released by the agency.

Barrymore, who gained fame as a child star in the film "ET: The Extra-Terrestrial," is the eighth-highest-paid actress in Hollywood, according to The Hollywood Reporter, earning more than $10 million a movie.

Josette Sheeran, WFP's executive director, said $50 "fills a child's cup for a year" and called on people to donate through the Web site www.wfp.org.

The organization said last year it provided more than 20 million school children with a daily cup of porridge, rice or beans and also gave many girls a monthly ration to take home to their families. It said up to 70 percent of its food used for school meals is bought from farmers in developing countries. (Reporting by Michelle Nichols; Editing by Eric Walsh)

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