Ashley Tisdale News: Watch Zac Efron Get Pranked by Castmates (US Weekly) /

Zac Efron's High School Musical castmates have it in for the show's star. Watch above as the 20-year-old's colleagues ??? including girlfriend Vanessa Hudgens and Ashley Tisdale ??? surprise him with water-guns and fill his trailer with toilet paper. See photos of teen stars two years ago. Efron gets soaked to the point where he has to take his shirt off ??? a sure attention-grabber. ...