Joel Madden not shaving until January for Nicole Richie

Joel Madden has vowed not to shave until January because Nicole Richie likes his "dirty face".

The Good Charlotte rocker has decided to grow a full beard and will not shave until next year, after polling fans online.

He initially posted on his twitter blog: "Should I shave? I haven't in five weeks."

Later, after being flooded with replies, he added: "OK, so the tweets have spoken - 80 per cent say I should not shave.

"If that is your wish, then I will not shave. But by mid-Jan I should have a beard."

Joel, 30, later revealed one of the main reasons he isn't shaving is because Nicole – with who he has two children, daughter Harlow, 22 months and two-month-old son Sparrow - likes a man with a beard.

He wrote: "Three good reasons why Joel should not shave: 1. It's November 2. Nicole likes me with a dirty face 3. I'm lazy. (sic)"

Joel recently revealed he gave his son – full name Sparrow James Midnight Madden – an unusual name to purposely make life hard for him.

He said: "My worry raising a son in Hollywood is, what will he have to struggle for? I wanted to give him a name that he's going to have to stand up for. I love it, I think it's a beautiful name."