Cara Delevingne on the cover of Vogue's September 2014 issue / Vogue

This is the third Vogue cover for the model in 18 months

Vogue has unveiled its September issue with Cara Delevingne as the cover star.

The popular model has scored the most coveted magazine cover of the year, the prestigious September issue.

This is the third Vogue cover for Delevingne in 18 months with the model also featuring on the March 2013 and the January 2014 covers.

In the sixties themed shoot photographed by Mario Testino, Delevingne wears a Louis Vuitton look from the first collection by Nicolas Ghesquiere for the house.

The September issue of the monthly magazine is traditionally the biggest of the year introducing the autumn/winter collections for the first time. This year is Vogue's biggest yet with 462 pages.

In addition to the cover of Vogue, Delevingne also stars in numerous autumn/winter campaigns including Topshop, Mulberry and Burberry.

Cara Delevingne on the March 2013 cover of Vogue

The issue hits newsstands on Monday August 4th.

Cara Delevingne on the January 2014 cover of Vogue