On Tuesday evening, guests gathered at the picturesque Hôtel du Cap-Eden-Roc, overlooking the Mediterranean, for a party hosted by Graydon Carter and David Zaslav in celebration of the 100-year anniversary of Warner Bros.’ founding.

The start time was seven, and a vintage cream Renault Estafette stood parked outside the restaurant, where Carter and Zaslav, in ivory linen jackets, greeted guests. (The matching, they say, was an accident.) Lily-Rose Depp, whose new series with Abel Tesfaye, The Idol, premiered at the Cannes Film Festival the night before, panicked momentarily as she walked in—she thought she’d worn black to a white party.

The sun was still high in the sky, above a sparkling blue sea dotted with boats, as waiters made the rounds with chilled Dom Pérignon. Leonardo DiCaprio arrived on a tender in a black baseball hat and mask, which came off as soon as he entered the Eden-Roc.

The barroom and terrace quickly filled up. Depp lit a cigar. Eva Longoria admired the view. C.A.A.’s Bryan Lourd and his husband, Bruce Bozzi, sipped on cocktails. The artists Rolf Sachs and Princess Mafalda von Hessen smoked Marlboros, which they put out in AIR MAIL ashtrays.

The musician and composer Daphne Guinness, who paired her signature black-and-white updo with a head-to-toe, silver-sequined ensemble and matching sky-high platforms, stood by the bar. Pierre Casiraghi, prince of Monaco, and his wife, the Italian journalist Beatrice Borromeo, chatted nearby; his sister Charlotte Casiraghi and her husband, the French film producer Dimitri Rassam, were also in attendance. John C. Reilly, wearing a tan suit and matching hat, spoke to the French photographer Brigitte Lacombe. Riviera fixture Jean Pigozzi snapped his Q2 Monochrom Leica as he mingled with friends.

Guests made their way to the glass-walled dining room, where round tables—set with white tablecloths, custom linen napkins, and ceramic AIR MAIL match strikers—featured centerpiece lampshades decorated with scenes from classic Warner Bros. movies.

Carter took his seat at the Casablanca table, where he and his wife, Anna, were joined by Joe Kahn, the executive editor of The New York Times; his wife, Shannon Wu; HBO head Casey Bloys; and Ruthie Rogers, the baroness, owner of London’s River Cafe, and wife of the late architect Sir Richard Rogers. Zaslav was seated nearby at the Maltese Falcon table, beside DiCaprio and across from Robert De Niro, Martin Scorsese, and his wife, Helen Morris. AIR MAIL Co-Editor Alessandra Stanley, meanwhile, chatted to the New York Times’s Michael Grynbaum and his wife, the screenwriter Juli Weiner, at the Exorcist table.

The playwright Jeremy O. Harris—who had a role in The Sweet East, which premiered at the Cannes film festival—shared a table with Depp and her Idol co-star Troye Sivan, the Australian singer. Their fellow cast member Hank Azaria was across the room, and others—Hari Nef, Da’Vine Joy Randolph, and Moses Sumney, plus their director, the Euphoria creator Sam Levinson—would join later.

Around 10, Scorsese, De Niro, and DiCaprio—whose new film, Killers of the Flower Moon, premiered at Cannes—made their way downstairs, past custom murals designed by Robert Risko, and onto the patio overlooking the Eden-Roc infinity pool, where scenes from Warner Bros. movies were projected. As D.J. Stretch Armstrong hit the decks, Sting got lost in the crowd with his wife, the actress Trudie Styler.

Scarlett Johansson, wearing an electric-green minidress, arrived straight from the premiere of Wes Anderson’s latest film, Asteroid City, with her husband, Colin Jost. The model Rosie Huntington-Whiteley and her partner, the actor Jason Statham, followed, as did the actors Rebel Wilson, Paul Dano, and Fan Bingbing; the singer Boy George; the models Alessandra Ambrosio, Sara Sampaio, and Georgia Fowler; the socialite Ivy Getty; the hotelier Marie-Louise Sciò; and the auctioneer Simon de Pury.

Guests made their way from the bar to the dance floor. At some point, waiters in striped T-shirts emerged carrying trays of hamburger sliders and fries.

The music wound down at a quarter to two. Johansson and Jost, who were staying at the Hôtel du Cap, went on to share a nightcap with Lourd and Bozzi. Other guests continued to an after-party on Tesfaye’s yacht, where the twinkling lights of the hotel perched on the cliff could be seen from the sea.

Elena Clavarino is the Senior Editor at AIR MAIL