BRAD Pitt is taking his kids to work with him. Our spies on the Warner Bros. lot in Los Angeles say Pitt, on site filming "Ocean's 13," drops off Maddox and Zahara, his two adopted children with Angelina Jolie, at the studio's day-care center every day. "The day care is available to anybody working on the lot, including secretaries and executives," said our source. But, "The workers at the day-care center are very protective of Brad and won't let any of the other parents approach him or talk to him." A rep for Pitt said, "It sounds like Brad, but he would say 'Hi' to anyone who wants to talk to him."

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