Will Ferrell and John C Reilly have stepped out for the premiere of their latest movie Step Brothers in LA.

The film -about two single guys who still live at home and then become stepbrothers when their parents marry each other - sees the Talladega Nights pair reunited with director and writer Adam McKay.

The pair are joined by co-stars Mary Steenburgen (who plays Will's mum) and Richard Jenkins (who plays John's dad) on the red carpet.

Talking about the movie Will said: "Well I kind of represent the character I play a little bit because I moved immediately back home after college for three years before I figured it out."

John said he wasn't the stay-at-home kind, however.

"See I come from a really big family," he said. "I think if I had only one brother I would be more apt to boomerang back but having six kids in the family I needed to get some space."

Talking about her work on the movie, Mary Steenbergen said: "I don't know, it was insane. And you know what? We improvised so much of this movie that I haven't seen the final film, so you can't go off the script to know what's going to happen. I mean, we were all over the place."