updated 11/12/2013 AT 2:00 PM ET
•originally published 11/12/2013 AT 3:00 PM ET
Lots of people dread going to their 20-year high school reunion. But not Bradley Cooper!
The Hangover star returned to his alma mater, Germantown Academy in Fort Washington, Pa., on Nov. 8 to catch up with friends from the class of 1993 and visit his favorite teachers.
“He has come back to GA a couple of times to talk to students,” a school official tells PEOPLE. “He loves seeing his old teachers and enjoys reminiscing with them. When he says he’s going to do something for the school, he does it. He’s a big supporter and proud to be a part of this school. So it was no surprise that he came to the reunion.”
While his girlfriend, British model Suki Waterhouse was in L.A., Cooper, 38, had a blast reliving the past with his best pal and fellow ‘93 classmate Brian Klugman, who stars on the FOX series Bones.
During the reunion, the Oscar nominee – who’s currently shooting a new movie in Hawaii with Rachel McAdams – roamed the halls with his former history teacher Kendall Mattern and toured the school’s new buildings. Later that night, Cooper and Klugman attended the reunion party at MaGerk’s Pub & Grill, where they chatted with friends.
“He was definitely having a great time,” says an onlooker. “He made his rounds and made sure to talk to everyone. He had fun catching up and hearing about their lives. There was lots of laughing and joking going on. He really loved seeing everyone.”
The onlooker adds: “He didn’t act like a movie star. Just a normal guy who was personable and friendly.”