Last night,T-PainjoinedMel Gibson,Isaiah Washington,Michael Richards, andDon Imusin the Foot-in-Mouth Club while toasting the release of his latest CD,Thr33 Ringz, at Manhattans Hiro Lounge.

The circus-themed concert had all the makings of a festive carnival, including clowns, midgets, a scantily clad woman on stilts, and surprise guest appearances by Diddy andBusta Rhymes.

But the celebration was derailed by the flurry of deeply offensive anti-Semitic jokes T-Pain (born Faheem Najm) hurled at Barry Weiss, chairman of the BMG Label Group, when he appeared on stage to offer his congratulations.

T-Pain

Credit: Johnny Nunez/WireImage

Among other crude and inappropriate remarks, the Grammy-winning rapper proclaimed that Jews run everything and they get all the money, and frequently shouted things like matzo ball!

and mazel tov!

An unruffled Weiss affably played along, remaining cool with a smile on his face as both gasps and giggles escaped from the stunned audience.