It was Lil' Kim's Last Supper.

Two dozen friends of the hip-hop star - including singer Mary J. Blige, Atlantic Records honcho Craig Kallman, producer Swizz Beats and lawyer Londell McMillan - gathered Sunday night for a weepy, prayerful dinner at Mr. Chow before Kimberly Jones submitted to the tender mercies of the federal detention center in Philadelphia yesterday.

"Everybody was crying," reports a Lowdown spy, noting that even Kim's hard- bitten publicist, Ronn Torossian, was in tears. Blige sat next to Kim and held her hand.

Kim wore a black Gucci dress and was still wearing it at 4 a.m. yesterday at the club PM, where she worked the room and thanked her fans - "It was like an Irish wake," said a witness - until exchanging it for a drab prison jumpsuit.

In one of many toasts at the E. 57th St. hot spot, McMillan said his client is "O.G., and that stands for 'original gangsta.' She was really an old- school gangsta by the way she spoke and the way she didn't speak." Kim is serving 366 days for conspiracy and perjury in the investigation of a 2001 shootout involving her posse and a rival rap group.

Kim's mother, Ruby Jones, addressed her daughter, saying: "I hope this can be like a resort where you can clear your head."

At points - all captured on camera for her yet-to-be snapped-up reality TV show - Kim broke down.

"I give so much of myself, and I expected the same from other people," she said. "The lesson I've learned is I can't expect that from other people."