Margot Robbie buys everyone a free drink during surprise visit to restaurant

Margot Robbie has surprised a bunch of diners at an Australian restaurant with an unforgettable act.

The Barbie star dropped into Mimi's in Sydney and understandably left loads of people shocked.

Imagine having a bite to eat and one of the biggest stars in Hollywood casually walks in with her husband Tom Ackerley.

But she didn't just sit down in the corner with a hat and sunnies on to avoid detection.

Instead, she told everyone they would be getting a free cocktail.

More than 120 people were quickly given a delicious and refreshing drink.

“She was extremely approachable and made everyone feel like they were a part of her lunch.”

Another explained to the outlet that the Aussie actor stayed at Mimi's to take pictures with everyone.

"She was so incredibly patient," the diner said.

“Everyone, young and old, were wanting photos with her. Some people were crying they couldn’t believe their luck. She left straight from the restaurant to catch a flight to Auckland.”

But she wasn't just doing this out of the goodness of her heart.

The cocktail included Papa Salt gin, which is owned by Robbie, Ackerley, Charlie Maas, Regan Riskas Maas, and Josey McNamara.

Charlie told everyone in the restaurant: “Sorry to interrupt you briefly.

"I hope you all have a Big Papa in your hand.

"We are the founders and creators of Papa Salt, a brand new Australian gin. We just wanted to pop in and shout you a round, so I hope you enjoy it.”

The crew who created Papa Salt said they took five years and nearly 60 different variations of the gin to get the perfect recipe.

It's made in Byron Bay with local botanicals.

"The public pushes the producers to make better, more interesting products.

"Combine that with the wealth of amazing ingredients we have in Australia and you have a recipe for beautiful gins.”