Are you sure about Heath Ledger? He used to date Heather Graham (not too shabby) and I think he's a new daddy with his current sqeeze who's name escapes me right now. Of course anything is possible I guess
Michelle Williams is Ledger's fiance. They had a kid a few months ago.
BTW: As far as I can recall, David Hyde-Pierce doesn't talk about his sex life. So, while he's rumored to be gay, it's still not confirmed.