Bill Gates has been spotted in Australia with a mystery woman, checking out the sights of Sydney outside the city's famed Opera House.

The two appeared to be taking a stroll round the city as they stopped to admire the panoramic views of the harbor.

It is not known who the billionaire Microsoft founder was spotted with, or the nature of their relationship, but the two stood to take in the breathtaking views together.

Gates, 67, split from his wife Melinda French Gates in 2021 after 34 years together, and 27 years of marriage.

The billionaire is currently down under after attending a meeting with Anthony Albanese, the prime minister of Australia.

The tech tycoon and philanthropist wandered around the exterior of the Sydney Opera House with the mystery brunette.

In the photos, Gates, who is worth $103billion and estimated to be the world's seventh richest person according to Forbes, kept his usual low profile with his personal security were no where to be seen.  

Gates walked along the Harbour-side in a navy baseball cap, blue polo shirt, and maroon trainers.

Gates' ex-wife, and mother to their three children, previously opened up about her 'unbelievably painful' divorce and explained that she 'just couldn't stay in that marriage anymore'.

Melinda French Gates told Fortune magazine in October that the Covid-19 pandemic helped give her the 'privacy to do what she needed to do.'

She also said in 2021 that her husband's affair with a Microsoft employee in 2000 had broken the 'trust' in their marriage.

She described how she sobbed on the floor as her marriage fell apart, having never thought that the relationship would end in divorce. 

The couple's divorce settlement is America's second-most expensive ever after Jeff Bezos' $38.3billion split with ex-wife MacKenzie Bezos. 

The Microsoft founder is currently down under after attending a meeting with Anthony Albanese, the prime minister of Australia.

The two met at the PM's residence at Kirribilli House to discuss climate change, energy and health issues. 

Gates is visiting the country with the Gates Foundation and representatives from his Breakthrough Energy company, which drives innovation in sustainable energy and in technology to reduce greenhouse gas emissions.

He thanked and commended the prime minister for his 'great partnership' on international health issues, including the Global Fund to Fight AIDS, tuberculosis and malaria.

Gates also made headlines on his trip after warning that Australia had to be ready for the next pandemic, which he said could be man-made and far more brutal than Covid-19.

Speaking to the Lowry Institute in Sydney earlier this week, Gates said political leaders needed to set aside their differences and work together to prepare for the next virus.

'With the pandemic we were foolish not to have the tools, the practice and global capacity to be on standby like we do with fire or earthquakes,' he said.

The billionaire philanthropist called for greater global cooperation and said that the Covid-19 pandemic as an example of how countries could improve on their response if they worked together.

But the tech pioneer has also been criticised for the use of his $70 million private jet while continuing to preach about the dangers of climate change.

The $70m Gulfstream, which was spotted on the tarmac at Sydney's Kingsford Smith airport, burns around 1,700 litres of fuel per hour.

Gates is thought to own four private jets, which has drawn criticism from both his  supporters and critics.

The private jet collection is reportedly worth $194 million and includes two Gulfstream G650ERs worth $70 million each and can carry up to 18 passengers.

In his 2021 book called How To Avoid Climate Disaster, Gates admitted to his double standards and said he was aware that he was an 'imperfect messenger on climate change'.

He wrote: 'The world is not exactly lacking in rich men with big ideas about what other people should do, or who think technology can fix any problem.

'I own big houses and fly in private planes – in fact, I took one to Paris for the climate conference, so who am I to lecture anyone on the environment?

'I plead guilty to all three charges. I can't deny being a rich guy with an opinion. I do believe, though, that it is an informed opinion, and I am always trying to learn more.'