Henry Cavill says his brothers will ''kick his arse'' if he gets too involved in the showbiz lifestyle.

While he already splashed out on a new Aston Martin DBS to celebrate landing the role of iconic superhero Superman in 'Man of Steel', the 30-year-old star is trying to remain grounded because he knows his four siblings will bring him back down to earth if he starts going over the top.

When asked if he's managing to keep his feet on the ground, he said: ''I've got four brothers who'll kick my arse if I get involved in the glitz and glamour, so I think so!''

The British-born star has already had a break from his roots while shooting the movie as he had to put on an American accent to play Superman, and found it ''easy'' to put on a different voice.

He told Nuts magazine: ''Doing a US accent is about exercising the muscles in your throat and your mouth. Sometimes it can sound great for a long period of time, sometimes your inflection's wrong.

''As long as you have a professional watching over you, telling you when you do something wrong, it can seem effortless.''