Pax Jolie Officially A Pitt

(CLICK HERE to view the papers filed by Angelina)

When little Pax learns to write, he's going to have one heck of a name to practice.

Pax Thien Jolie officially had Pitt added to his last name today following proceedings in Los Angeles County Superior Court.

Pax Thien Jolie-Pitt was adopted from a Vietnam orphanage in March.

Mom Angelina filed the court papers in April to have daddy Brad's last name legally added to the three-year-old's moniker.

All three of Pax's siblings – Maddox, Zahara and Shiloh – also have Jolie-Pitt as their last name.