Zac Efron has slipped and broken his jaw.

The 'High School Musical' star has had his mouth wired shut after falling flat on his face outside his Los Angeles, California, home over the weekend.

According to E! News, the '17 Again' star is unable to speak at the moment and also sustained a large cut on his face during the late night accident.

The 26-year-old actor has been obliged to cancel his upcoming promotional tour for his new movie 'That Awkward Moment' after being given stitches by medics and told to rest up.

Zac completed a stint in rehab earlier this year for alleged cocaine and alcohol abuse, but appears to have made a full recovery. The 'Parkland' star is thought to have entered treatment after friends expressed their concern about his ''erractic'' behaviour during filming for raunchy new comedy, 'Neighbors'.

He recently purchased a new $4 million home in Los Angeles which is hidden away from prying eyes in a gated community in the Hollywood Hills, and boasts its own waterfall and relaxing spa.

The Hollywood hunk - who was previously dating Vanessa Hudgens - has since been linked to 'The Mortal Instruments' actress Lily Collins.