I thought it would be funny if we could summarize all the celebritys that play/played WoW. As rumors are of no interest at all, let's skip all of that crap.
I know that Mila Kunis (the cute girl from "That 70's Show") played WoW and said this in several interviews. Couldn't find a copy of any of those interviews though, since I can't remember for what paper/site she did them.
Also, please, if possible, link some kind of "proof", since it's very easy for anyone to just say "Ozzy Ozbourne plays WoW. Period." You get the deal...
But hey, knock yourselves out then!