Will Ferrell doesn't care about his appearance

Actor Will Ferrell says he doesn't "give a s**t" about how he looks, after recently crashing the birthday party of a 100-year-old woman and singing alongside two elderly women, insisting that his bravado is key to his long career.

"I just don't give a s**t how I look. It's kind of like walking on hot coals. It's not that I wasn't afraid to take the first step. Just once I did, the coals were never that hot," he told Britain's GQ magazine, reports femalefirst.co.uk.

He went on to concede that he's happy to take big and outrageous risks with his comedy even if it's not to everybody's liking.

"There's a perverse pleasure in knowing that 75 to 80 per cent of people will get it, but knowing 20 to 25 per cent will not only think it's not funny, but will be like, 'That's dumb. Why would we do that? I don't get it. We hate that guy'," Ferrell said.

The 47-year-old actor says his humour is entirely based on instinct just like his comedy inspiration and the former star of "Saturday Night Live", Steve Martin.

He said: "(He was) this anti-comedian comedian, he'd walk out with an arrow through his head... I just loved that. I read in one of his books that some people go with political comedy... but why not just go with instinct?"