The Annie Hall actress reprises her role in the sequel to 2018's Book Club.
Rachel Zegler's vocals are "jaw-dropping" in one particular scene.
Damien Chazelle premiered his movies La La Land and First Man at the festival.
An 11th Formula One team is being created for the untitled movie.
Jeff Bridges would be surprised if the Coen brothers wanted to make a sequel.
The Hollywood stars will help jury president Ruben Östlund award the Palme d'Or for best film.
Michael Douglas will be honoured with the award during the festival's opening ceremony on 16 May.
James Gunn was talked out of killing off the character by Marvel boss Kevin Feige and longtime MCU producer Louis D'Esposito.
The Gladiator 2 cast currently includes Paul Mescal, Barry Keoghan, Joseph Quinn, Connie Nielsen, and Denzel Washington.
Taika Waititi will reportedly direct the movie from a script by Dahvi Waller.
Allison Williams admitted working in the horror genre hasn't made watching the movies any easier.
Chris Evans turned to his friend and Knives Out co-star Ana de Armas about replacing Scarlett Johansson.
