Zac Efron and Vanessa Hudgens arrive at the world premiere of High School Musical 2 at Downtown Disney.Steve Granitz/WireImage.com - Wednesday, August, 15, 2007, 9:15 PM

Zac Efron arrives at the premiere of High School Musical 2 at the Downtown Disney District at Disneyland Resort .Steve Granitz/WireImage.com - Wednesday, August, 15, 2007, 9:15 PM

Zac Efron, Mickey Mouse and Minnie Mouse arrive at Disney's High School Musical 2 world premiere at Downtown Disney.Gregg DeGuire/WireImage.com - Wednesday, August, 15, 2007, 9:15 PM

Monique Coleman and Zac Efron arrive at the world premiere of High School Musical 2 at Downtown Disney.Steve Granitz/WireImage.com - Wednesday, August, 15, 2007, 9:15 PM

Vanessa Hudgens arrives at the world premiere of High School Musical 2 at Downtown Disney.Gregg DeGuire/WireImage.com - Wednesday, August, 15, 2007, 9:15 PM

Vanessa Hudgens arrives at the world premiere of High School Musical 2 at Downtown Disney.Gregg DeGuire/WireImage.com - Wednesday, August, 15, 2007, 9:15 PM

Selena Gomez arrives at the world premiere of High School Musical 2 at Downtown Disney.Steve Granitz/WireImage.com - Wednesday, August, 15, 2007, 9:15 PM

Monique Coleman arrives at the world premiere of High School Musical 2 at Downtown Disney.Steve Granitz/WireImage.com - Wednesday, August, 15, 2007, 9:15 PM

Miley Cyrus and Minnie Mouse arrive at the world premiere of High School Musical 2 at Downtown Disney.Steve Granitz/WireImage.com - Wednesday, August, 15, 2007, 9:15 PM

Lucas Grabeel arrives at the world premiere of High School Musical 2 at Downtown Disney.Steve Granitz/WireImage.com - Wednesday, August, 15, 2007, 9:15 PM

Kaycee Stroh arrives at the world premiere of High School Musical 2 at Downtown Disney.Steve Granitz/WireImage.com - Wednesday, August, 15, 2007, 9:15 PM

Emily Osment arrives at the world premiere of High School Musical 2 at Downtown Disney.Steve Granitz/WireImage.com - Wednesday, August, 15, 2007, 9:15 PM

Cody Linley and Mickey Mouse arrive at the world premiere of High School Musical 2 at Downtown Disney.Steve Granitz/WireImage.com - Wednesday, August, 15, 2007, 9:15 PM

Chris Warren Jr. arrives at the world premiere of High School Musical 2 at Downtown Disney.Steve Granitz/WireImage.com - Wednesday, August, 15, 2007, 9:15 PM

Ashley Tisdale arrives at the world premiere of High School Musical 2 at Downtown Disney.Gregg DeGuire/WireImage.com - Wednesday, August, 15, 2007, 9:15 PM

Ashley Tisdale and Jennifer Tisdale arrive at the world premiere of High School Musical 2 at Downtown Disney.Gregg DeGuire/WireImage.com - Wednesday, August, 15, 2007, 9:15 PM

Vanessa Hudgens stars as Gabriella Montez and Zac Efron stars as Troy Bolton in High School Musical 2.Disney Channel/Bob D'Amico - Monday, July, 30, 2007, 8:30 PM

Corbin Bleu stars as Chad Danforth and Monique Coleman stars as Taylor McKessie in High School Musical 2.Disney Channel/Bob D'Amico - Monday, July, 30, 2007, 8:30 PM

Ashley Tisdale stars as Sharpay Evans in High School Musical 2.Disney Channel/Adam Larkey - Monday, July, 30, 2007, 8:30 PM

Lucas Grabeel as Ryan Evans performs "Fabulous" in High School Musical 2.Disney Channel/Adam Larkey - Monday, July, 30, 2007, 8:30 PM

Vanessa Hudgens as Gabriella Montez and Zac Efron as Troy Bolton (behind the scenes) in High School Musical 2.Disney Channel/Adam Larkey - Monday, July, 30, 2007, 8:30 PM

Corbin Bleu as Chad performs "What Time is it?" in High School Musical 2.Disney Channel/Adam Larkey - Monday, July, 30, 2007, 8:30 PM