Zac & Vanessa -- Hot Buns Coming Through

3/20/2009 3:35 PM PDT BY TMZ STAFF
... as in hamburger buns.

Zan & Vanessa: Click to watch
Zac Efron and Vanessa Hudgens hit up the drive-thru at Six Dollar Burger haven Carl's Jr. yesterday

Fast food should only be eaten in moderation -- wouldn't want to lose this.