Saturday was take your kids to work day for Brad Pitt!
The 47-year-old actor brought his two oldest sons, Maddox, 9, and Pax, 7, to the set of World War Z, the flick he's filming this summer in Marsa, Malta.
Based on the book of the same name, the project -- set to hit theaters in 2012 -- features Pitt as United Nations employee Gerry Lane.
Hanging out in papa Pitt's trailer for a portion of their visit, Maddox and Pax were able to see Pitt film a shooting scene that featured him running away from zombies. Both kids covered their ears to muffle the noise from the scene's sound effects, but were quickly comforted by a bodyguard on set.
"Brad was very cheerful and happy to have his kids on set," a source told Us Weekly of Pitt, who also serves as one of World War Z's producers. "When Brad finished the scene, he took to the boys to his trailer and looked thrilled to see them. [While walking] he didn't hold their hands -- I think he likes to treat them like big boys!"
Maddox and Pax's set visit is just the latest item in their Maltese summer itinerary.
On Wednesday, the boys (along with siblings Zahara, Shiloh, Knox and Vivienne) joined mom Angelina Jolie for a family outing to a local bowling alley.
"They had a lots of fun and played for the entire two hours, laughing and giggling," an eyewitness said the Pitt-Jolie brood, who were joined by a few nannies and unidentified kids for the afternoon of fun.
As Pitt shoots World War Z, the family has been staying in a rented, palatial $11 million mansion in Qrendi, Malta. Filming for the project will move to the United Kingdom in mid-July.