For a worthy cause, pop singer Christina Aguilera sings an acapella version of the tune, "Twinkle, Twinkle, Little Star" as part of the new public service announcement for the World Food Program in the fight against hunger. As a mother herself, the star finds it hard to picture children suffering from starvation. "By lending my voice in the new PSA, I hope to inspire people to join the fight against hunger," "Twinkle, Twinkle, Little Star is a classic lullaby, but also a reminder to me that every night, millions of children go to sleep hungry," The campaign is urging people to make a difference by donating at selected fast food chains around the world. The proceeds will be benefitting the UN World Food Program, which Aguilera serves as an Ambassador as well.