People all across Europe are preparing to use a new form of money.
As from 1 January, 12 countries in Europe will start using the euro - instead of their old currencies.
This means old foreign coins, like the French franc and the German Mark, will not be used anymore.
It will be the biggest-ever changeover of money in history.
Fancy dress costumes
But Britain has decided not to use the euro yet - so we will still be using the pound for the time being. Sweden and Denmark have also 'opted out' of using the euro at this stage.
Around Europe, people will be celebrating the launch of the euro:
- In Germany, a huge euro sign will be lit up outside the European Central Bank at midnight
- In Dublin, Ireland, people will parade through the streets dressed in euro-style fancy dress costumes
- In France, the oldest bridge in Paris, the Pont Neuf, will be lit up in euro colours