I'm sorry have you not read the thread? He has tried to do something about it, he doesn't put up with her because she has boobs, but rather because they share the same friends - a pretty valid damn excuse if you ask me. Losing your friends over some dumb, self-centered, arrogant twat (guy or girl) fucking sucks, that's that, the end. It sucks.
@OP: Talk to her privately about it, be frank, but be polite. If she still shuts you down and bitches at you, just leave the convo (still being polite), go talk to your two friends without her presence about it, if they're seriously incapable of seeing how much of a bitch she is, just because they think they can get some (Wich they wont), I'm sorry but quite frankly your friends aren't worth it, in my opinion. Best of luck, let us know how it turns out!