L'Oréal hosted a red-themed extravaganza, with Victoria's Secret models wearing eye-popping outfits - but all eyes were on Bradley Cooper and Irina Shayk, who made the Paris event their official debut as a couple.

Debbie Harry performed and Mark Ronson DJed at the Coach Prom Party in Paris. The brand is getting its mojo back by reinventing Americana for a young generation, as seen in creative director Stuart Vevers choosing a high school prom setting with mini burgers, pizzas and cupcakes served to a crowd that included American actresses Chloe Grace Moretz and Riley Keough.

With creative director Olivier Rousteing's naughty sense of humour, the notorious Lapérouse restaurant, on the Left Bank, made it the perfect choice for Balmain's post-show party. Lapérouse was a 19th-century den of iniquity, which was popular not only with the likes of Emile Zola, Victor Hugo and Gustave Flaubert, but also with crooks who cooked their books and cocottes who, along with their clients, made use of the petits salons upstairs.

Rousteing must have been tickled pink to have his celebrity friends partying within these disreputable walls, although most of the evening's tittle-tattle was about Kendall Jenner and Gigi Hadid, affectionately referred to as KenGi, who temporarily swapped hair colour for the Balmain catwalk.

Marks & Spencer hosted a party to launch its Archive by Alexa collection, with Alexa Chung, London's pre-eminent "It" girl. But the party of London Fashion Week was thrown by Erdem and held among the props from a 1940s film lot that provided the atmospheric backdrop for the label's runway show at the Old Selfridges Hotel. Among the ghosts of Bette Davis and Greta Garbo (Erdem's muses) danced Keira Knightley, Arizona Muse and the newly minted Dame Natalie Massenet.

In Italy, Prime Minister Matteo Renzi hosted a lunch of lobster salad and pasta for Milan's fashion elite. Giorgio Armani, Donatella Versace and Gucci boss Marco Bizzarri were among the guests; Tod's Diego Della Valle sat next to Prada's Patrizio Bertelli and opposite Renzo Rosso.

The quirkiest entertainment, however, was the Looking for Marni theatrical celebration of the label's sunglasses collaboration with Marchon. Performers from Susanna Beltrami's dance company created dreamy characters modelling the new range of glasses and Bauhaus-inspired costumes.

A week after their fashion fairy tale in Milan, Domenico Dolce and Stefano Gabbana were paying tribute to Paris with their Ville Lumiere ("city of light") capsule collection, launched with a party. Celebrity guests wore silk blouses, dresses and T-shirts emblazoned with the national flag and souvenir images of the French capital.