Maddox, his adopted son with Angelina Jolie, was seven yesterday and was taken gokarting near the family's 800-acre moated French home in Aix-en-Provence.
Pitt, who turned up in white vest, sunglasses and pork-pie hat, kept a close eye on his son, staying a few feet behind him as they hurtled round together.
Va va voom: Brad and Maddox show off their driving skills at a go-karting track in France
Maddox, who was born in Cambodia, is a veteran of the track. He has been go-karting since the family moved to the south of France this year.
This week Maddox's new siblings Vivienne Marcheline and Knox Leon were pictured in Hello! magazine for a reported $15 million deal.
That's just the sort of money a go-kart racer turned Formula One driver can make in a good year...
On yer head: Maddox put on his helmet before taking to the track
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