1) "Vanessa Hudgens confirmed, in an October 2007 interview with Teen Magazine, that she and Efron had been dating since the filming of High School Musical, which took place in 2005. They were still dating as of April 5, 2009."
Source and further information:
http://en.wikipedia.org/wiki/Zac_Efron
2) "In addition to being funny and cute, Zac seems to be a genuinely nice guy -- even when it comes to celebrity blogger Perez Hilton and his never-ending quest to out Zac, all while referring to him as "Zacquisha."
"I know it’s very addictive to read that kind of stuff. It’s entertainment," he says of Perez's juicy dish. "He’s doing something right. I think he does a great job. Honestly, if the worst he can say about me is that I’m gay, then I think I’ll be fine. I can handle it." "
Source and further information:
http://dailyblabber.ivillage.com/.../...s-gay-rumors.html
Further information:
http://www.chacha.com/topic/gossip-girl/is-zac-efron-gay