Drag queens are like birthday cakes: layered and coated with thick frosting painstakingly applied to evoke strong reactions. The cake most full of surprises in this town full of queens is Ivana, the shiny-lipped, bawdy broad from Buenos Aires. When she struts atop the bar at Cactus in white hot pants and go-go boots, be prepared for an onslaught of camel-toe jokes from a girl who is just about ready to bust out of her own outfit. Try as she might to be classy, whiskey-voiced Ivana can't help it. If her lip-synching to saccharine pop is a little off, her sense of timing when she emcees her shows in Spanish is fierce. Watch her sparks fly Friday nights at Ozone and Saturday nights with Adora at Cactus.