The fashionable actress signs off on a good cause in the Big Apple. Plus: Mandy Moore, Tom & Katie and more

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SIGNING ON

Spokesmodel Mischa Barton makes her mark at the unveiling of Keds' spring 2007 collection at Bungalow 8 in New York on Wednesday. The custom-made logo dress, which was worn by Barton for the company's upcoming ad campaign, will go up for auction Dec. 11 on eBay to benefit Sharon Stone's Planet Hope charity.