Christina Aguilera's new World Hunger Relief PSA video - watch
The new PSA plays Aguilera's 2003 single 'The Voice Within' from her Stripped album, as a mother cries about not being able to feed her child.
"Every night, millions of children go to bed hungry and every night million of parents can't find the words to make it all okay, but you can," the singer says in the appeal.
Aguilera is the global spokesperson for World Hunger Relief, a campaign by restaurant company Yum! Brand.
She has previously explained that she teamed up with World Hunger Relief to set a good example for her son Max.
Aguilera was honoured for her philanthropy at last month's ALMA Awards ceremony, receiving the 2012 NCLR Special Achievement Award.
The Voice coach's seventh album Lotus will be released in November 2012.