Brad Pitt and Angelina Jolie kicked off their son Pax's seventh birthday yesterday with a hot air balloon ride over Paris! His siblings Maddox, Shiloh, and Zahara went along for the sightseeing adventure, though Knox and Vivienne sat out the excitement. Brad and Angelina brought their four oldest out for even more celebrating last night, when they threw Pax a small party on a boat that traveled along the Seine. The whole Jolie-Pitt clan is temporarily in Paris, as Angelina gears up for a junket for The Tourist and Brad has similar obligations for Megamind. Their weekend, though, was all about family — click through to see photos!