Sales may not be brisk for Kevin Federline's upcoming East Coast dates, but he's all but guaranteed an enthusiastic hometown welcome when he takes the KIIS FM Stage at tonight's West Hollywood Halloween Carnaval at 8:45. The appearance comes in support of his album, "Playing With Fire," which had its nicely timed debut on record store shelves and iTunes today. ("Be the first to write a review," Apple's online music store plaintively solicits, as K-Fed stares out blankly from behind a desk on his album cover, as though he were hosting one of his own inevitably underattended CD signings.) And while coming to the festivities dressed up as Britney's background-dancing babydaddy might seem so, like, 2005, we'd encourage last-minute costume scramblers to throw on the wife beater, baggy pants, and baseball cap, and show up anyway, taking the stage behind their inspiration as his backing chorus line of high-kicking, hip-hopping K-Fedettes.