Angelina Jolie's son Pax Thien now has the Jolie-Pitt family name.

Jolie traveled to Vietnam in March to adopt Pax from a Ho Chi Minh City orphanage. The 31-year-old actress filed adoption papers as a single parent because she and partner Brad Pitt aren't married.

The 3-year-old boy is now Pax Thien Jolie-Pitt, according to a decree signed Thursday by Superior Court Judge Gerald Rosenberg.

Jolie filed legal papers in April to include Pitt's last name.

Pitt, 43, and Jolie have three other children: 5-year-old Maddox, who was adopted from Cambodia; 2-year-old Zahara, who was adopted from Ethiopia; and daughter, Shiloh, who was born to the couple last May 27.