The Untold Story of the Rise and Fall of Disney Channel's Tween Empire' by Ashley Spencer, the new book sheds light on the early days of Zac Efron and Vanessa Hudgens' romance on the set of 'High School Musical' as their former costars and other people involved in the movie share stories.

Zac Efron and Vanessa Hudgens’ teenage relationship on the High School Musical set was detailed in a recent book excerpt, with one costar referring to Vanessa as “poor girl.”

High School Musical star Vanessa Hudgens’ net worth is estimated at $16 million and a $1 million condo in Brooklyn.

The time is apparently ripe for reflection on and from beloved Disney Channel stars of the recent past. As Demi Lovato's Child Star documentary hits Hulu, culture journalist Ashley Spencer's debut nonfiction book Disney High sheds even more light on the Disney ecosystem of the 2000s and 2010s.