Question about Girls Gone Wild.

I've never watched it, so maybe I've no idea what i'm talking about. But I always thought it was videos of girls on vacation acting like nincompoops. Then I read an interview with some actress once or something who said she'd appearing in episodes of girls gone wild.
So what is it? Is it a reality show of girls acting like they've got no sense, or is it a show with actresses acting like girls who have no sense???