When in Italy, you dress to impress. ✨ The 78th Venice International Film Festival has officially kicked off in Italy, with stars from all over the world gathering for the event. Here's a peek at some of Hollywood's finest who showed up, starting with Jessica Chastain and Oscar Isaac, who posed together at a screening of "Scenes from a Marriage." 📸 Miguel Medina, AFP via Getty Images; Daniele Venturelli, WireImage