Squeaky clean Zac Efron isn't ruling out the possibility of ditching his trademark boy next door image and his stripping off for future roles.

The High School Musical star stepped out to hundreds of screaming fans last night at the premiere of his latest film 17 Again in Leicester Square – taking time to sign autographs on the red carpet before chatting to reporters about the film.

Upon being asked about whether he would shed his clothing for part Zac replied, "You look so excited. I don't know. Honestly, I don't know."

Zac meets his British fans at the London premiere of '17 Again' last night

In the film, which also stars Matthew Perry, Zac plays a 37-year-old man who is given the chance to relive his youth as a 17-year-old.

Zac added, "I can't wait to see what everybody thinks... this is a movie to bring along the fans... I want to bring them along to a new adventure."

Zac recently dirtied his good boy reputation in a raunchy photo shoot, posing shirtless alongside a naked girl for Interview magazine.

See Zac and Robert Pattinson battle of the heartthrobs below