Three-year-old Pax Thien Jolie is now Pax Thien Jolie-Pitt, according to a decree signed Thursday by Superior Court Judge Gerald Rosenberg.
Jolie traveled to Vietnam in April to adopt the boy from a Ho Chi Minh City orphanage. The actress filed adoption papers as a single parent because she and partner Brad Pitt are not married.
Jolie filed name-change legal papers April 23 to include Pitt.
Jolie, who turns 32 on June 4, and Pitt, 43, have four children: 5-year-old Maddox, who was adopted from Cambodia; 2-year-old Zahara from Ethiopia; Pax and daughter Shiloh, who turned 1 on May 27.
Photos: Angelina Jolie: Viet Mom