Paris, France :: Daddy Brad Pitt, 42, took son Maddox Jolie-Pitt, 4, to a play park this afternoon while leaving pregnant Angelina Jolie, 30 and daughter Zahara Jolie-Pitt, 1, back at the hotel to rest. Brad and Maddox took well to rolling around in the dirt, getting mud stains all over their jeans. Brad's bottom looks like it needs a little cleaning! Brad also continued to show Maddox the ropes to remote-control car racing. (See first set of pictures of Brad teaching Maddox remote-control car racing.) More Brad Pitt and Maddox pictures (9x).