Sarah Murdoch, 50, wears a pair of socks with slides as she steps out in tight activewear

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Comfort first! Glamorous Sarah Murdoch, 50, wears socks with $89 Birkenstock rubber flip flops as she steps out in skintight sportswear after enjoying the AFL Grand Final with billionaire husband Lachlan

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She is always one of the best dressed on the red carpet.

But sometimes even Sarah Murdoch chooses comfort over style.

The glamorous model wife of media mogul Lachlan Murdoch wore a pair of socks and flip flops when she hit the gym in Sydney on Monday.

Comfort first!  Sarah Murdoch, 50, wore a pair of socks with $89 Birkenstock rubber flip flops as she headed out for a workout in Sydney on Monday in tight sportswear

Comfort first! Sarah Murdoch, 50, wore a pair of socks with $89 Birkenstock rubber flip flops as she headed out for a workout in Sydney on Monday in tight sportswear

The blonde beauty wore gray sockets with a pair of $89 black Birkenstock rubber sandals.

The 50-year-old showed off her sensational figure in sleek black leggings paired with a zip-up sports top.

She was wearing designer sunglasses and was carrying a small leather pouch.

The 49-year-old showed off her sensational figure in tight black leggings paired with a zip-up sports top

The 49-year-old showed off her sensational figure in tight black leggings paired with a zip-up sports top

The 49-year-old showed off her sensational figure in tight black leggings paired with a zip-up sports top

The mother of three revealed her youthful face by not wearing an ounce of makeup and tied her signature blonde bob back in a low ponytail.

Sarah and her husband Lachlan returned to Sydney from Melbourne on Saturday evening after seeing the AFL Grand Final.

They were spotted after the match short-circuiting their private jet.

The pair were joined by their friends, Seven Group CEO Ryan Stokes and his wife Claire, who were all seen from the plane.

The mum of three revealed her youthful face by not wearing an ounce of makeup and tied her signature blonde bob back in a low ponytail

The mum of three revealed her youthful face by not wearing an ounce of makeup and tied her signature blonde bob back in a low ponytail

The mum of three revealed her youthful face by not wearing an ounce of makeup and tied her signature blonde bob back in a low ponytail

While holding their hand luggage, they saw the group on the tarmac talking to the airport staff.

Lachlan and Sarah are parents to sons Kalan Alexander, 17, and Aidan Patrick, 16, and daughter Aerin Elisabeth, 12.

They have been happily married for 23 years after they tied the knot in 1999.

The couple have a home in Bellevue Hill, Sydney, known as Le Manoir.

Sarah and her husband, media mogul Lachlan Murdoch, are parents to sons Kalan Alexander, 17, and Aidan Patrick, 16, and daughter Aerin Elisabeth, 12. They have been happily married for 23 years after they tied the knot in 1999.

Sarah and her husband, media mogul Lachlan Murdoch, are parents to sons Kalan Alexander, 17, and Aidan Patrick, 16, and daughter Aerin Elisabeth, 12. They have been happily married for 23 years after they tied the knot in 1999.

Sarah and her husband, media mogul Lachlan Murdoch, are parents to sons Kalan Alexander, 17, and Aidan Patrick, 16, and daughter Aerin Elisabeth, 12. They have been happily married for 23 years after they tied the knot in 1999.