Pauly D celebrated his birthday Saturday in Vegas as only a Jersey Shore boy can -- by getting cake smeared all over his bare chest! Breaking Celebrity News caught up with the DJ as a bunch of bikini-clad babes did the honors.

It all went down poolside at the Palms Casino Resort July 3.

A group of bikini-wearing lovelies presented Pauly Delvecchio with a cake in the shape of turntables. Then the real fun began. Pauly threw off his shirt and the girls dug into the cake, smearing it all over his torso.