Celebrities including Demi Moore, Dua Lipa and Elizabeth Hurley gathered on Sunday night for the show, which was kept under wraps until the last minute. Models on the catwalk included Kate Moss, Amber Valletta and Naomi Campbell.

The brands said the joint capsule, co-designed by Donatella Versace and Fendi’s creative directors Kim Jones and Silvia Venturini Fendi, was a first for both houses and born out of friendship and mutual professional respect.

The designers swapped roles to create each others’ clothes.

The Versace by Fendi collection mixed the Fendi monogram with Versace’s signature Greek Key motif, while the Fendi by Versace collection featured a punk-rock aesthetic, with safety pins embellishing Fendi pieces.

It’s not unheard of for fashion designers to join forces, but they are usually not direct rivals.

Earlier this year, Gucci designs were crossed with silhouettes and logos by fellow Kering brand Balenciaga.

This time, the collaboration, dubbed “Fendace”, brings together Fendi, which is part of Louis Vuitton owner LVMH’s stable, with Versace, which is owned by Capri Holdings, the American firm that is also home to Michael Kors and Jimmy Choo.