well, if we want to talk about famous pop culture icons that went to brown (as in real people)...that's a whole other list
leelee sobieski was there when i was a student
eva amurri just graduated
there was a recent article about an actress named nan zhang (from "gossip girl" apparently) who is leaving the show to start at brown next year
in the past kate burton, laura linney, duncan sheik, lisa loeb were all students at brown.
and then there were several children of presidents (or presidential candidates), the most famous of which was JFK, jr.