Um, excuse us? This model is 53 years old??

On Thursday, this Australian beauty took to Instagram showing off her booty in a backless one-piece while taking a morning walk — and we are stunned!

We totally understand how this Batman and Robin actress got the nickname “The Body”!!

Related: Who Just Got This ENORMOUS Arm Tattoo??

Think you know who it is??

If you were thinking Elle Macpherson — you were right!

The Sports Illustrated star shared:

Good morning -#happyontheinside @superelixir @abysseofficial ?@bushandocean @phoeberwhiteA post shared by Elle Macpherson (@ellemacphersonofficial) on Aug 17, 2017 at 4:27am PDT

[Image via Instagram.]

Continued:  

Guess The 53-Year-Old Celebrity Showing Off Her Buns On The Beach!