Brad Pitt and Angelina Jolie threw a birthday party for son Pax that only they could throw -- by renting a boat on the Seine River to check out the Eiffel Tower!

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Brad, Angie, Shiloh, Zahara and Maddox all loaded onto the boat in France last night for Pax, who turns 7-years-old today.

The twins, Knox and Vivienne sat this bash out and were not seen at the party.

Check out all the fun pics!

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