Leonardo Dicaprio's not just starring the "The Wolf of Wall Street," he's one of the flick's producers - and he's insisted on sitting in during casting auditions for gorgeous babes in their mid-20's who'll appear stark-raving NAKED in the film. Said My Backstage Spy: "For the initial audition, the girls will have to come in wearing sexy clothes that show off their bodies - but anyone chosen to screen test with Leo will have to play the scene in the nude." (Print Edition - 5/21)