Instant classics “Genie In a Bottle” and “What a Girl Wants” leapt off of Christina Aguilera's sizzling 1999 debut—showcasing an unstoppable voice matched only by the pop prodigy's willingness to provoke and seduce. By 2002's “Beautiful,” coquettish temptation had given way to raw self-reflection, and string-backed arrangements signaled the emergence of a hard-won grace. A decade later, Aguilera was peeling back new layers with “Your Body,” an honest exploration of lust that throws caution to the wind.