Vanessa Hudgens and Zac Efron in High School Musical 2 by Bob D'Amico/Disney Channel Vanessa Hudgens and Zac Efron in High School Musical 2 by Bob D'Amico/Disney Channel

As Disney Channel's High School Musical 2 continues to rack up ratings - in addition to the record 17.2 million who caught Friday's premiere, 8.4 mil tuned in for Saturday's rerun and 7.5 mil crooned in for Sunday's sing-along - talk continues of a feature-film adaptation of the original. Stars Zac Efron and Vanessa Hudgens, though, may not be available, if only because Disney is "only offering them $1 million each," a source tells the New York Post. A studio rep responds, "We are still in negotiations with the entire cast," but declined to comment further on the talks.

UPDATED: An HSM2 encore is scheduled for Thursday at 8 pm/ET. Because you haven't seen it enough, Moms and Dads.