The High School Musical co-stars, who have been dating since 2005, have long been dogged with rumours they are set to walk down the aisle.
Earlier this year (Feb09), Efron was forced to deny reports they were planning their wedding after U.S. tabloid the National Enquirer claimed he proposed to Hudgens during a promotional trip to Japan in January (09).
But the actress has hinted the pair is set to seal their union - when they can co-ordinate their busy work schedules.
She tells Britain's News Of The World newspaper, "We haven't set a date and if we did we'd keep it secret for as long as possible.
"Why? What if one of us was offered a major film part? Then we'd have to postpone our marriage and people would say we'd split up. And we don't want that.".