Vanessa Cheating On Zac?

Could it be? Is it possible? We spotted the always-classy Vanessa Hudgens in Hollywood recently with her boyfriend Zac Efron. Wait, scratch that. The guy she's with is not Zac Efron (although they do look fairly similar). What's up with that, Vanessa? It's entirely possible that these two are just friends (who isn't?) and that Zac is busy at yet another Hairspray premiere, but still! Something's fishy...