I would NOT say anything.
The ONLY time that I would tell someone about a fake bag would be if it was a friend who seemed to genuinely want a real one, but had somehow gotten duped into buying a fake one. I would tell her just to protect her from being humiliated or gossiped about by others.
But at this party, the people don't need to be protected from embarrassment b/c they are ALL carrying fakes, LOL
The ONLY time that I would tell someone about a fake bag would be if it was a friend who seemed to genuinely want a real one, but had somehow gotten duped into buying a fake one. I would tell her just to protect her from being humiliated or gossiped about by others.
But at this party, the people don't need to be protected from embarrassment b/c they are ALL carrying fakes, LOL