No offense to Vanessa fans but this premiere is for HAIRSPRAY which is Nikki and Zac's movie NOT Vanessa's so she doesn't need to be at the premiere.  Nikki wasn't at the HSM premiere's was she.  Just because Vanessa and Zac are dating doesn't mean they have to be together constantly.  GEEZ. I'm getting so annoyed by everyone making such a big deal about Nikki and Zac's friendship.  If Zac and Vanessa want to hold hands they can just like Zac and Nikki did.