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    First Look At Yahoo! CEO Marissa Mayer's Baby Boy

    The new mom tweeted a photo of her beautiful baby boy, Macallister, as they attended YaBoo—the company's kiddy Halloween party.

    One month old - Macallister and me heading to YaBoo, the children's Halloween party at @Yahoo! http://t.co/TNxVnV2K

    One month old - Macallister and me heading to YaBoo, the children's Halloween party at @Yahoo! http://t.co/TNxVnV2K-- marissamayer

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