Brad Pitt installed a swear jar on the set of 'World War Z'.

The hunky actor - who has kids Maddox, 11, Pax, nine, Zahara, eight, Shiloh, six, and four-year-old twins Knox and Vivienne with fiancee Angelina Jolie - tried to prevent cast and crew on the set of the zombie apocalypse movie from swearing in front of the youngsters who played his on screen daughters.

Mireille Enos - who plays Brad's wife in the movie - told People magazine: "He started a swearing jar. If anybody swore around the kids, they had to put a pound in the jar. Those kids went home rich."

Brad, 49, also worked hard to keep the girls entertained on set, even performing magic tricks for them.

Mireille added: "He's as normal as any guy you can meet and he's such a natural at being a dad. He would bring games, tell funny stories and do magic tricks for the girls who played our daughters."

Brad's adopted son Maddox had a small cameo in 'World War Z' as a zombie and the youngster loved being in an action film.

The Hollywood heartthrob said: "Maddox has got a small piece in it. He's a zombie who then gets shot. I don't know what that says about my parenting! (My kids) love these kinds of things and that's the thing that first drew me to it."