Former model and Sydney socialite Sally Mount has died suddenly at the age of 58. (She is pictured here at a fundraiser in Woollahra in December 2000)

Sydney’s A-list is rocked by tragedy as the model wife of millionaire investor dies unexpectedly at age 58 after a game of tennis in Port Douglas

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Former model and Sydney socialite Sally Mount has died suddenly at the age of 58.

Sally, who was married to the English millionaire investor Duncan Mount, is believed to have died shortly after a game of tennis at her Port Douglas home last weekend.

She is survived by her husband and their four daughters, Alexandra, Camilla, Jamilla and Olivia, reports The Sunday Telegraph.

Former model and Sydney socialite Sally Mount has died suddenly at the age of 58. (She is pictured here at a fundraiser in Woollahra in December 2000)

Former model and Sydney socialite Sally Mount has died suddenly at the age of 58. (She is pictured here at a fundraiser in Woollahra in December 2000)

Former model and Sydney socialite Sally Mount has died suddenly at the age of 58. (She is pictured here at a fundraiser in Woollahra in December 2000)

Sally and Duncan, an investment trader who made a fortune buying and selling property in Asia, relocated from Hong Kong to Sydney in the late ’90s.

They splashed out $15million on an Elizabeth Bay mansion known as ‘Boomerang’, which at the time was Sydney’s most expensive home.

The Mounts were famous for hosting lavish parties at the property, and soon became known as one of Australia’s most beloved society couples.

Sally, who was married to the English millionaire investor Duncan Mount (left), is believed to have died shortly after a game of tennis at her Port Douglas home last weekend

Sally, who was married to the English millionaire investor Duncan Mount (left), is believed to have died shortly after a game of tennis at her Port Douglas home last weekend

Sally, who was married to the English millionaire investor Duncan Mount (left), is believed to have died shortly after a game of tennis at her Port Douglas home last weekend

The three-storey, Spanish Mission-inspired mansion, which is now worth a jaw-dropping $80million, boasts 25 rooms, palatial interiors, a large swimming pool and a private cinema modelled on the State Theatre.

The stunning property was famously used as a set for the film Mission: Impossible 2, which was shot almost entirely in Sydney in 1999.

After selling Boomerang for $20.7million in 2002, the family relocated to an eight-bedroom mansion in Ingleside, Northern Sydney.

Sally and Duncan, an investment trader who made a fortune buying and selling property in Asia, relocated from Hong Kong to Sydney in the late '90s. They spent $15million on a mansion in Elizabeth Bay (pictured), which at the time was Sydney's most expensive home

Sally and Duncan, an investment trader who made a fortune buying and selling property in Asia, relocated from Hong Kong to Sydney in the late '90s. They spent $15million on a mansion in Elizabeth Bay (pictured), which at the time was Sydney's most expensive home

Sally and Duncan, an investment trader who made a fortune buying and selling property in Asia, relocated from Hong Kong to Sydney in the late ’90s. They spent $15million on a mansion in Elizabeth Bay (pictured), which at the time was Sydney’s most expensive home

The Mounts were famous for hosting lavish parties at the property, and soon became known as one of Australia's most beloved society couples. (Pictured from left: Sally Mount, Victoria Morish, Iggy Diamani and Sarah Ferguson's sister Jane Luedecke on August 10, 2004)

The Mounts were famous for hosting lavish parties at the property, and soon became known as one of Australia's most beloved society couples. (Pictured from left: Sally Mount, Victoria Morish, Iggy Diamani and Sarah Ferguson's sister Jane Luedecke on August 10, 2004)

The Mounts were famous for hosting lavish parties at the property, and soon became known as one of Australia’s most beloved society couples. (Pictured from left: Sally Mount, Victoria Morish, Iggy Diamani and Sarah Ferguson’s sister Jane Luedecke on August 10, 2004)

Four years later, they purchased Paul Hogan’s famous Cedar Springs hideaway in Byron Bay for $9million. 

‘We just fell in love with it,’ Duncan told the Courier Mail at the time. 

‘It’s the sort of house that if you love it, you look around it in awe and cannot think of anything you could change.’

In 2010, the Mounts relocated again to Port Douglas to live out their retirement years.

In 2006, the Mounts purchased Paul Hogan's famous Cedar Springs hideaway in Byron Bay for $9million (pictured)

In 2006, the Mounts purchased Paul Hogan's famous Cedar Springs hideaway in Byron Bay for $9million (pictured)

In 2006, the Mounts purchased Paul Hogan’s famous Cedar Springs hideaway in Byron Bay for $9million (pictured)

Pictured: Paul Hogan in the 2001 film Crocodile Dundee in Los Angeles

Pictured: Paul Hogan in the 2001 film Crocodile Dundee in Los Angeles

Pictured: Paul Hogan in the 2001 film Crocodile Dundee in Los Angeles

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