UPDATE: You can see pictures of Clinton on the set here.

If you thought Mel Gibson's hiring -- then firing -- would be The Hangover 2's biggest casting news, you would be wrong.

Turns out there's another guy who could possibly generate more buzz than the beleaguered actor: former President Bill Clinton.

According to People, Clinton filmed a brief cameo in the comedy sequel over the weekend. An aide to the former POTUS -- who was already in Bangkok, Thailand talking about clean energy -- says he appeared as himself.

No other details about Clinton's guest stint were revealed.

The Hangover 2 is scheduled for release on May 26, 2011.