Dubbed a ‘legend of the runway’, Christie Brinkley turned up on the set of Good Morning America (GMA) this Wednesday making us all jealous in a red body-con Hervé Leger dress.

At an unbelievable 57-years-old, we think with that body the glamorous mother of three could have easily passed for a model half her age!

Leaving us all green with envy, Brinkley left everyone at Talent Management wondering what her secret is.

As usual, her secret is in fact no secret at all – just good old fashioned exercise. Last year, Brinkley revealed that her incredible supermodel body is down to that fact that she never stops exercising – even when she is drying her hair or brushing her teeth!

So, proving that just because you’re in your 50s or have children, with a little determined effort, maintaining a little youth can be done!