By peoplestaff225
Updated September 10, 2008 03:30 PM
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Politics are first and foremost on the mind of first-time mom Jessica Alba. That’s why she signed on to appear in an advertising campaign for Declare Yourself, a non-partisan, non-profit group dedicated to empowering every eligible 18-year-old American to register and vote in the upcoming presidential election. The 27-year-old actress — who in June welcomed daughter Honor Marie, 3 months — says that motherhood is "the best thing ever." "[Honor’s] getting chubby and she fully holds her head up," the proud mama shares with PEOPLE in it’s new issue. She adds,

Honor is also the first child for Jessica’s husband, Cash Warren. Click here to see Jessica’s ad for Declare Yourself.