McDonald's Has Invented A Bigger Big Mac

Be warned: a bigger Big Mac is officially a thing.

Over in the UK, McDonald's is launching a bigger Big Mac, officially known as the 'Grand Big Mac'.

The new burger, as well as a downsized version of the Big Mac called a 'Mac Jr', will launch in stores over in Britain tomorrow.

The Grand Big Mac contains the same ingredients - two beef patties, special sauce, lettuce, cheese, pickles and onions on a sesame seed bun.

But it's definitely bigger than the original as pictures have shown.

The burger is a limited edition and reports suggest it'll only remain in stores until March 20.

No word yet on whether it's making its way over here to Australia, but we can keep our fingers crossed.