Zac Efron and Vanessa Hudgens popped into the Good Morning America studios this morning with fellow co star, Ashley Tisdale.¬† Zennifer promoted High School Musical 2¬†together even though they are not a couple anymore.¬† Zac is rumored to be dating his Hair Spray co star Nikki Blonsky.¬† A pal of Zac says the two have made out and he is not bothered by her slight weight problem … uh huh.