Sydney: Bill Gates is keeping a low profile outside the Opera House

Bill Gates restrained himself as he enjoyed a day out in front of the Sydney Opera House.

The billionaire was joined by a mysterious brunette as the couple strolled past the landmark.

They visited the opera house on Monday and, according to one viewer, went largely unnoticed.

Mr. Gates, 67, the co-founder of Microsoft, was fourth in last year’s Forbes list of the rich.

He wore a casual baseball cap, blue polo shirt and sneakers in Sydney.

Security teams were nowhere to be seen unless hidden in plain sight.

The viewer who spotted Mr Gates later said: “Nobody else noticed who Bill was or approached him. He was obviously trying to keep a low profile.

“Nobody would have had any idea that one of the richest and most powerful men in the world was around them.”

Mr Gates is in Australia on business and met with the country’s Prime Minister earlier this week.

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