As part of its Big Mac 50th celebrations, from today Macca's in Australia will be serving up more of the iconic burger, with the arrival of its bigger brother the Grand Big Mac.

According to the press release by McDonald's Australia: "The Grand Big Mac burger is packed full of all the classic Big Mac ingredients but with more special sauce over two larger 100 per cent Aussie beef patties, with more lettuce, cheese, and onions, all served on a larger sesame seed bun.

McDonald's Australia marketing director Jo Feeney said: "We're excited to be celebrating 50 years of the Big Mac, one of Macca's most popular burgers here and around the world. To celebrate this special occasion we're introducing the limited edition Grand Big Mac — giving our customers more of what they know and love."

The Grand Big Mac will be available across McDonald's restaurants in Australia for a limited time only, news.com.au reported.

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The Grand Big Mac lands on Macca's menus around Australia. Photo / Supplied
The Grand Big Mac lands on Macca's menus around Australia. Photo / Supplied

McDonald's New Zealand is also celebrating the Big Mac's 50th anniversary by making the regular Big Mac available 24 hours a day around the country for a limited time.

Fans of the iconic burger lost their minds over it on social media.

Big Macs appear to be in the news a bit lately.

Earlier this month a Wisconsin man (who already holds the Guinness World Record for eating the most Big Macs) reached another insane feat, polishing off his 30,000th burger.