The A-list cast raised $9.2 million at an exclusive charity bash on a yacht off this Riviera resort for Sudanese uprooted by the savage conflict in Darfur.
It was "a chance to raise some money for something we thought was important," Clooney told reporters.
The problem in Darfur, which he has seen in person, "isn't going to go away until the rest of the world is outraged enough to stop it," he said.
Damon added: "This is a life-and-death struggle going on right now."
Late Thursday, they and the rest of the film's cast donned tuxedos for the premiere of "Ocean's Thirteen," the third in a series of heist films directed by Steven Soderbergh in the mould of the "rat pack" movies of the 1950s and 1960s
The feature to be released worldwide next month was one of the most highly-awaited entries in the official festival line-up, even though it was not in the race for the Palme d'Or prize.
As well as Clooney, Pitt and Damon, the movie stars Al Pacino, Andy Garcia, Don Cheadle and Ellen Barkin.
It follows Danny Ocean (Clooney) and his team of hustlers as they knock over in spectacular fashion a Las Vegas casino run by a ruthless businessman with mob connections.
All but Pacino turned up for the most packed media conference of the festival a journalistic crush for some of the biggest stars on the planet.
Soderbergh said the "Ocean's" films were deceptively superficial, and often demanded more technical innovation on his part than other movies he's done. "They're tricky, very tricky," he said.
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