The day to don your most festive outfit with pride is almost upon us - and wearers get to raise money to help children across the world at the same time.
Every year, Brits slip on their best and most bizarre Christmas jumpers.
But did you know it’s not just for the fun of it and perhaps making a spectacle of yourself, it is in fact aimed to raise money for charity.
Christmas Jumper Day was launched in 2012, as a fundraising campaign by Save the Children.
The idea is to wear a Christmas jumper to school or work - and then make a minimum £1 donation to Save the Children.
Money raised goes to the charity's on-going projects to alleviate child poverty in Britain and across the globe.
Some people will organise additional fundraising activities on the day in question. Click here to sign up your workplace.
But when is Christmas Jumper Day 2017?
Christmas Jumper Day normally takes place on a Friday in the second or third week of December.
In 2017, it falls on Friday, December 15.
While there are no rules for Christmas jumpers (although do check with your dress code policy if your organisation has one before wearing it to work), whatever you wear, be careful and ensure it is appropriate for the environment you are within and does not cause offence – ask somebody to cast an eye over it as they may see something you have missed which may be deemed inappropriate!
Do share your Christmas jumper pictures.
Here's mine for 2017