How do you ask Zac Efron out?

call him, his phone number is 1-945-635-2155

You don't.

He is currently in a relationship with his High School Musical co-star Vanessa Hudgens.

LOL!

hecks no ! lol tripping he only go out with one person and that is me so get ur facts stright!

OMG why wud ya want 2 know hw 2 ask Zac Efron out plain in simply stop dreaming well tht wht people tell me because well I'm in love with zac efron!