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

Pop stars and supermodels front the most important edition of fashion magazines

This week some fashion magazines released their most important and biggest issue of the year.

Why most important? September is the January of fashion, is the month in which editorials officially say farewell to summer and welcome autumn. This year, British Vogue, for example, released its biggest issue yet of 462 pages, with various shoots featuring all of the autumn/winter 2014 collections. British supermodel Cara Delevingne is photographed by fashion and royalty photographer Mario Testino to front the cover.

In 2011 the documentary September Issue revealed the behind the scenes of producing this edition, portraying legendary American Vogue editor Anna Wintour as the one to fear, but the one that achieves perfection.

This month the magazine stands look heavy packed with thick magazines and the most exciting content.

Other key September issue covers include emerging model and Kardashian sister, Kendall Jenner, 18, who after fronting Love magazine's biannual issue, scored two covers of Teen Vogue, one in which she appears wearing a big baby blue hat.

Pop star Lady Gaga posed with her French bulldog puppy, Asia, in a pink Chanel-esque outfit for the cover of Harper’s Bazaar magazine. And Kate Upton was photographed by Matt Jones for the cover of British Elle.

The American Vogue, edited by Mrs Wintour, is one of the most awaited issues and is yet to come out this month.

Kendall Jenner, Amy Adams and Adriana Lima on the cover of Love magazine
Vogue editor Anna Wintour appointed editorial director of Conde Nast titles