Haley Joel Osment is all grown up ... and playing a bad guy?

Haley Joel Osment is all grown up and menacing in the new "Entourage" movie, which he told ET was a dream come true.

"I remember when ["Entourage"] first came out it was huge with kids in my high school," Osment told ET. "It's just a really surreal experience to be a part of it in such a small way."

In the film, Osment plays Billy Bob Thornton's son, who stirs up trouble for Ari Gold (Jeremy Piven) -- a long way from his first job in a Pizza Hut commercial.

"I was four years old," Osment remembered.

A year after landing that TV spot, Osment was playing Tom Hanks' son in "Forrest Gump." Five years later, Osment became a household name for his Oscar-nominated performance in "The Sixth Sense."

"A lot of kids can't make that transition to become adult actors," co-star Kevin Dillon said. "He's done it."

"He's just a fantastic actor," Adrian Grenier said. "When Hayley Joel got the part, I was like, 'That's it.'"

Osment gave us the key to his success and level-mindedness.

"I'm really lucky to have a life that isn't exclusively revolving around the business," he said.

"Entourage" opens June 3.

More from AOL.com:
Janice Dickinson suing Bill Cosby for defamation
Kanye West slams Billboard Music Awards for 'ridiculous,' 'unwarranted' censorship
Bella Thorne and Gregg Sulkin spotted smooching