I'm still inclined to think the kiss at the foyer will remain private for some reason. It's so intimate and awesome people shouldn't be disturbing it, damnit!
Though if others found out about the first kiss, the second kiss will have to imply something more than just, 'let's kiss for no reason at all'. I'm still a bit pessimistic about this, so I think the first kiss will be remain a secret and the second kiss is the one that would be seen by someone.