Zac Efron explains condom drop

Zac Efron has attempted to explain an incident that saw him drop a condom on the red carpet.

Speaking on The Late Late Show with Craig Ferguson, the Hollywood star revealed he was wearing the same trousers at the premiere of the film The Lorax as he had the previous night.

The High School Musical actor, whose other movie credits include The Lucky One and The Paperboy, appeared a little awkward when asked about the incident, noting things were made more embarrassing due to the fact The Lorax is aimed at a younger audience.

He stated: "Well, I'd worn the pants the night before ... I don't know where I'm going with this."

Efron, who is currently single but famously used to go out with the actress Vanessa Hudgens, refrained from elaborating further on the matter.

Although the star was embarrassed by the incident, it showed that he takes the issue of safe sex seriously.