FANS of the burger chain McDonald's will no doubt be McLovin' today's news after two new burgers have been revealed. 

The Grand Big Mac and Mac Jr go on sale today, Tuesday, as part of the chain celebrating 50 years since the original Big Mac was launched. 

But you will have to be quick as they are only available until March 20. 

The Grand Big Mac is described as a 'double cheesy, extra beefy' Big Mac with two larger 100% pure beef patties sandwiched between a sesame seed bun and dressed with two times the special sauce, lettuce, onions, pickles and two slices of American cheese.

The Mac Jr has the same toppings but is smaller and with one less patty. 

The Big Mac was first created in February 1967 by American McDonald's franchisee Jim Delligatti in Pennsylvania, USA.

He originally wanted to call the burger 'The Aristocrat' but McDonald's chose to go with the now famous name, Big Mac.

The burger arrived in the UK in 1974 when the first UK restaurant opened.

Steven Howells, head of marketing at McDonald's UK, said: "As an iconic McDonald's product, we are proud and excited to be celebrating 50 years of the legendary Big Mac and for the first time ever in the UK, introducing the two new sizes for a limited time.

'We know a lot of our customers will remember the 1974 launch of the Big Mac in the UK and have continued to enjoy the burger and pass the Big Mac love on since then, it remains our most iconic burger."