The couple marches through Washington D.C., to protest toxins in vaccines. Plus: Lindsay & Samantha, Michelle Williams, Kate Hudson and more
Published: Wednesday Jun 04, 2008 | 05:10 PM EDT
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After giving each other shout-outs on their blogs, John Mayer and dad-to-be Pete Wentz team up Tuesday for a jam session at Mayer's home in Pacific Palisades, Calif.
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