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FIRST PHOTO: See George & Amal on Their Wedding Night!

Heroes in Hard Times 2009

Hollywood's Heroes

Whether it's dishing out food to the homeless or campaigning for children, Hollywood's A-List – Brad, Oprah, Leo, George and more – take time to give back. By Cara Lynn Shultz

JESSICA SIMPSON

The singer visited Kenya on behalf of her ongoing cause, Operation Smile, which offers medical assistance to children with facial deformities. "I believe that a smile is contagious," Simpson told PEOPLE. "I believe in this charity and that's why I'm here."