The 'Moneyball' actor, who also raises Pax, nine, Zahara, seven, Shiloh, six, and four-year-old twins Knox and Vivienne with fiancee Angelina Jolie, splashed out on a Suzuki DRZ-125 for him and has had a motocross trail built in the grounds of their sprawling French estate, reported Contactmusic.
"Brad's always been a generous dad and as Maddox has shown a keen interest in bikes, he thought he may as well get him started. He was down at the house the other week and got the builders to dig him a muddy trail all through the woods and around the lake.
"Brad was just as excited as Maddox about it, though he's put in little jumps and puddles so they'll get really muddy. The bike has an automatic clutch and, of course, Brad's bought him his own helmet and protective gear," a source said.