U.S. actress Angelina Jolie (2nd L) leaves the Tam Binh orphanage with her previously adopted son Cambodian-born Maddox in Ho Chi Minh City March 15, 2007.(Xinhua/Reuters Photo)

Photo Gallery>>> BEIJING, April 25 (Xinhuanet) --Angelina Jolie has filed a petition in Los Angeles County Superior Court toadd boyfriend Brad Pitt's last name to that of her newly adopted son, Pax, according to media reports Wednesday.

Jolie, in court documents obtained by U.S. Weekly, states that she is "the sole adoptive parent of the child" and is asking for the name change "in order that her child's last name will incorporate and be combined with the last name of her partner and be the same as that of her other children."

So her new son's name would change from Pax Thien Jolie to Pax Thien Jolie-Pitt.

Angie adopted 3-year-old Pax from a Vietnam orphanage in March and immediately changed his name from Pham Quang Sang to Pax Thien. Pax translates to "peace" in Latin, while Thien has a definition of "heaven" or "sky" in Vietnamese.

Pitt has a daughter, Shiloh, with Jolie and has become the adoptive father of her other two adopted children, 5-year-old son, Maddox, from Cambodia, and 2-year-old daughter, Zahara, from Ethiopia.

Shiloh, Maddox and Zahara already share the last names of Jolie and Pitt, though the couple has not married and say they have no plans to wed.

The 31-year-old Oscar-winning actress co-starred with Pitt in "Mr. and Mrs. Smith."

(Agencies)