Rachel Weisz winning a Best Supporting Actress Oscar for The Constant Gardener is hugely important for Africa, the UN World Food Programme head has said.
James Morris praised the film, which tells of corporate corruption in Kenya, as important for highlighting some of the difficulties faced in Africa.
He said Weisz supported the WFP and claimed more people would listen to her talk about hunger and poverty than him.
The WFP says 20 million people face starvation in north-east Africa.
Mr Morris said: "Rachel Weisz has been a very strong advocate for the work of the World Food Programme and the issues of the world's hungry poor.
"People pay a heck of a lot more attention to her when she talks than me when I talk."
Mr Morris, who has recently returned from a visit to Kenya, said the country was co-operating with the UNWFP.
But he claimed the country was facing an "almost unbelievable catastrophe" because of low rainfall.
Millions of people face starvation across Somalia, Djibouti, Eritrea, Ethiopia, Tanzania, Burundi, the Congo and Rwanda, according to the UN.
On Sunday, 34-year-old Weisz won the Oscar for Best Supporting Actress for her role as aid worker Tessa Quayle in The Constant Gardener, developed from a John Le Carre novel.