Happy 5th Birthday Pax Thien Jolie-Pitt!

Pax Thien Jolie-Pitt turns five years old today!

Name: Pax Thien Jolie-Pitt

Birthday: November 29, 2003 (adopted March 15, 2007)

Parents: Angelina Jolie and Brad Pitt

Siblings: Big brother Maddox, 7, and younger siblings Zahara, 3 1/2, Shiloh, 2 1/2, and 4 1/2-month-old twins Knox and Vivienne

Facts about him:

• Adopted from Vietnam in 2007 at age 3.

• His birth name was Pham Quang Sang, but was changed after his adoption; it translates to "peaceful sky." (Pax, a name Angelina's mother really liked, means "peace" in Latin, while "thien" is Vietnamese for "sky.")

• Attended preschool in Prague with Zahara.

Right after Pax's adoption Angelina said,

"You can imagine what courage it takes to be in all new surroundings, with new people and a new language," she tells PEOPLE. "He is very strong." However, by four months later, Pax - described as a "little bit shy" by the orphanage director - became "probably the wildest person in the house right now. I'm still having trouble convincing Pax that underwear and pants go together – underwear is not pants!"

She also did an interview in May 2007, in which she said,

"Pax is almost three and a half and has never made a real decision for himself because everybody does everything in a group in the orphanage. There were all these things he'd never had. The first time I gave him a bath, he was suddenly laughing, out of his mind. He took five baths in one day. We'd be talking and he'd take his clothes off and run into the bathroom. The first two days, he cried a lot. I hired a translator, and he would explain what was going on. The first night, I slept alone with him. I was expecting him to wake up and scream, but he woke and just stared at me. I handed him a stuffed animal, and we walked around the room pointing at things. By day three, he didn't want me to put him down. I think he got used to the reality that somebody loves you and that's what a mommy is."

Click here to see more of Pax!