It appears that One&Only honcho Sol Kerzner can’t open a new property these days without holding a weekend-long star-studded extravaganza. Four months ago, he did so for his Atlantis in Dubai, and last Thursday the billionaire invited scores of famous faces, including Nelson Mandela, Clint Eastwood, Morgan Freeman and Thandie Newton, to his newest resort, The One&Only Cape Town in South Africa.

“Cape Town is fantastic,” enthused Matt Damon, who has been filming the rugby-inspired drama “The Human Factor” in South Africa with Eastwood and Freeman.

Everyone was feeling the love late into the night as jazz heavies like Dave Koz, Bebe Winans, Hugh Masekela and Kyle Eastwood (Clint’s son) performed a jam session. Not even a sudden but brief power outage could dampen spirits. Winans even got the guests to belt out a few bars. “Are you ready?” he asked Marisa Tomei, Robert De Niro and Grace Hightower, who all sang, “I’m ready!”

The ever-confident Sharon Stone said, “I was born ready.”

The performance ended with Mariah Carey singing an impromptu riff that brought down the house.