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School is in session for the Jolie-Pitt kids.

On Monday morning, Shiloh, 4, Pax, nearly 7, and Maddox, 9, began school in Budapest (no sign of Zahara, 5).

A source tells UsMagazine.com parents and teachers have been ordered to sign security agreements stating that they won't chat to the press. If they disobey, they may be subject to a fine; if the contact with the media continues, their child could even be suspended from the school until further notice, the source says.

While the kids are being schooled, mom and dad are focusing on work.

Brad Pitt is continuing to shoot "Moneyball" in Boston this week. Last week, Jolie was spotted in Hungary beginning work on her directorial debut, a Bosnian love story.


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