Angelina Jolie shares pride in son Maddox

Angelina Jolie said she's so proud that her 18-year-old son is leaving home to study biochemistry in South Korea. The actress was seen in a video released several days ago dropping her son

Maddox

off at

Yonsei University

in Seoul, and holding back tears.

"I didn't realize everybody had watched me do it," she said Saturday at the D23 Expo in Anaheim, California. "It felt very private when we were there and it was just fun. But the school is so wonderful and we're so proud that he's there. And it's a great university and I'm just amazed I have a son who's that smart."