Zachary David Alexander Efron (plays Troy Bolton)
for more:
http://en.wikipedia.org/wiki/Zac_Efron
Vanessa Anne Hudgens (plays) Gabriella Montez
For more:
http://en.wikipedia.org/wiki/Vanessa_Hudgens
Actually, they are dating each other
Hudgens confirmed in an interview with Teen Magzine that she is currently dating her High School Musical and High School Musical 2 co-star Zac Efron.[9][10]
Also, I've been to Canada. There are many magazines say that they're dating. And obviously, they're in love in the movie