It's up to the listener to decide whether ''Jam,'' the first single from the famously curvy reality-TV mini-mogul, really qualifies as a singing debut. While a thumping loop from überproducer The-Dream pounds in the foreground, Kardashian's vocals sound like the Auto-Tune the News guys took a crack at a pre-party voicemail she left for one of her sisters. ''I'm goin' out tonight/It's goin' down, headed straight to the front of the line,'' she informs us in a matter-of-fact verse. The beat shakes and grinds; Kardashian yawns and reapplies her lip gloss. If she wants to join the ranks of real dance divas, Kardashian will need to develop some sonic assets as titillating as her visual ones. D —Adam Markovitz