Watch out Jay-Z, you're not only one who can party it up on a big boat.

Get a load of Pax Jolie-Pitt!

Mega-stars Brad Pitt and Angelina Jolie threw a fabulous birthday party for their son, Pax, aboard the chartered Josephine river boat along the Siene River on Sunday night in Paris, France -- and Breaking Celebrity News has all the photos.

On hand to help Pax celebrate his 7th birthday were his siblings: Maddox, 9, Zahara, 5, and Shiloh, 4.