We spotted Maddox going for a little dip in the pool at his Cannes hotel yesterday while Mama Angelina was off a photocall.  The lil guy seemed to be having a ball as played in the water, making sure to keep his goggles on at all times.  Mad then toweled off and was whisked away by an older friend, presumably a nanny (or is it manny?).  His mom might be a huge star, but clearly he's more impressed with the fact that he gets to play in the pool!