The Brit has been in Los Angeles preparing for the launch of his new The Late Late Show for months and he reveals despite his growing fame, security guards at CBS Studios have no idea who he is.

And he was caught out recently when he dashed out to grab a bite to eat and wasn't allowed back on the lot.

Corden says, "I came in and I just went to the guy, 'Hey, man, how ya doing?' and he said, 'I'm gonna need to see your pass...' I went, 'Oh no, it's in there (studio)... I just left...' and he went, 'I'm gonna need to see your pass'."

The actor/comedian pointed to a massive billboard across the road featuring his face and told the security guard he was making a big mistake.

Corden reveals, "I went, 'Is that not better than a pass...? That pass is so big, I can't fit it in a truck'. And he went, 'I don't see it, man'... Is there anyone I can call to come down?' I went, 'Yeah, the offices of The Late Late Show With James Corden, because that's my name...' and one of our production staff had to come down."

Corden's new show debuted on Monday (23Mar15).