The group Declare Yourself, a declared non-partisan group founded by Norman Lear, has released a Web ad with many celebrities urging young voters to register. Among the stars appearing in the ad: Leonardo DiCaprio, Halle Berry, Jennifer Aniston, Tobey Maguire, Eva Longoria Parker, Ellen DeGeners, Forest Whitaker, Dustin Hoffman, Demi Moore, Sarah Silverman, Jonah Hill, Ashton Kutcher, Courteney Cox, Laura Linney, Natalie Portman, Jamie Foxx, Usher, Kyra Sedgwick, and will.i.am.