Brad Pitt and Angelina Jolie took Pax for a hot-air balloon ride and Parisian cruise Sunday evening to celebrate his seventh birthday.

Sibs Maddox, 9, Zahara, 5, and Shiloh, 4, also joined them for the ride down the River Seine.

On the boat: Cake and some birthday balloons.

Pitt, 46, was spotted filming the kids on his video camera, while Jolie, 35 (in a beige trench coat) was seen pointing out notable sights during the ride.

The gang spent the Thanksgiving holiday in Paris, where Jolie is promoting her new Johnny Depp thriller The Tourist.

They will soon have another reason to celebrate: Pitt turns 47 Dec. 18.