Funnyman Steve Martin insists fans will never see his bloopers on film sets - because he refuses to let TV cameras shoot the proceedings.

The CHEAPER BY THE DOZEN star hates to think of a DVD featuring his mistakes and on set gags and so he insists all his directors ban outside film crews from his sets.

He says, "I hate that 'Making of...' for television. I'll do a take seven, 12, 15 times to get it right, but it just doesn't seem right to have a guy there with a video camera, putting your scene on TV or DVD.

"I have a policy that there's no shooting during takes. You can shoot a rehearsal but you can't shoot a take. You're giving your secrets away; you don't tell the audience how it's done."