First up was Roberts, who was in Venice to promote her new film, Luca Guadagnino's After The Hunt. Her look for Friday's photo session comprised a transitional striped shirt, blue wool blazer, and straight-leg denim, worn with a heritage gold buckle belt, woven shoes, and a leather bag. It may have seemed understated, but the opportunity to wear it was something of a coup: a first glimpse of what's to come from Versace's new creative director, Dario Vitale, whose debut collection won't be seen in its entirety until later this month at Milan Fashion Week.

For the rest of the world, it's a great source of autumn wardrobe inspiration. For Seyfried, who shares stylist Elizabeth Stewart with Roberts, the influence was more immediate. In a comment under Stewart's Instagram post of Robert's outfit, she asked, "Please let me wear the same outfit". Clearly, all parties obliged, and Seyfried arrived in Venice before the premiere of The Testament of Ann Lee on Monday in exactly the same look.

Seyfried then shared a picture of herself wearing the outfit to her own Instagram feed with the caption, "Thanks for sharing", tagging Roberts and adding the hashtags: "sustainable" and "shareyourlooks". For some, the move represents an important fashion statement as well as a touching moment of sisterhood.