Comfort first! Glamorous Sarah Murdoch, 50, wears socks with $89 rubber Birkenstock slides as she steps out in tight activewear after enjoying AFL Grand final with billionaire husband Lachlan

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

But sometimes even Sarah Murdoch opts for comfort over style.

The glamorous model wife of media mogul Lachlan Murdoch was seen wearing a pair of socks with slides as she headed to the gym in Sydney on Monday.

Comfort first! Sarah Murdoch, 50, wore a pair of socks with $89 rubber Birkenstock slides as she stepped out in tight activewear for a workout in Sydney on Monday

Comfort first! Sarah Murdoch, 50, wore a pair of socks with $89 rubber Birkenstock slides as she stepped out in tight activewear for a workout in Sydney on Monday 

The blonde beauty sported grey socklets with a pair of black $89 rubber Birkenstock sandals.

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

She accessorised with designer sunglasses and carried a small leather pouch bag.

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

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

The mother-of-three revealed her youthful visage by wearing not a scrap 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 watching the AFL Grand Final.

They were spotted touching down on their private jet shorting after the game.

The couple was joined by their friends, Seven Group CEO Ryan Stokes and his wife Claire, all of whom were seen disembarking from the aircraft.

The mother-of-three revealed her youthful visage by wearing not a scrap of makeup and tied her signature blonde bob back in a low ponytail

The mother-of-three revealed her youthful visage by wearing not a scrap of makeup and tied her signature blonde bob back in a low ponytail

Clutching their carry-on bags, the group were seen chatting to airport staff on the tarmac.

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

The have been happily married for 23 years after tying the knot in 1999. 

The couple own 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. The have been happily married for 23 years after tying 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. The have been happily married for 23 years after tying the knot in 1999

The comments below have not been moderated.

The views expressed in the contents above are those of our users and do not necessarily reflect the views of MailOnline.

We are no longer accepting comments on this article.