Fast-food chain McDonald's is giving away free McMuffins on Sunday morning. 

Free single McMuffins will be available to all customers from when breakfast starts, normally at 5am until it ends at 11am. 

The only catch, is that you will have to download the Mcdonald's app onto your phone. 

But it is free and available on Android and IOS devices. 

Today (Saturday) the restaurant will be offering out its iconic Big Mac (or Vegetable Deluxe) for just 99p - again via the app - with this offer being available from 11am until midnight. 

To find these offers you'll need to open the deals section of the app where they will be available on their respective days. 

Each offer is only available once.