Her glam squad -- makeup artist Jake Bailey, hair stylist Mark Townsend and stylist Simone Harouche -- collaborated on the mentor's sultry appearance.
"Monday's live show look was all about the eyes. Christina's eyes are the most beautiful shade of blue so I love to make them stand out," Bailey writes on Aguilera's website. He lined her eyes with Urban Decay 24/7 Glide-On Eye Pencil in Zero ($19, urbandecay.com) and added multicolored glitter for "a little 'disco.'"
To create her "straight, shiny and gorgeous" 'do, Townsend used Dove Nourishing Oil Care Serum ($6.79, drugstore.com) and blow-dried the star's hair sleek. "I absolutely love this hairstyle on Christina, I think we should do this one again soon!" he gushed on her site.
And to complement the makeup and hair, Harouche chose a figure-flattering black and white patterned Intermix minidress with Lanvin earrings and a Loree Rodkin ring. The extra sparkle on Aguilera's nails was courtesy of Sally Hansen Salon Effects Nail Polish Strips in Lust-rous ($9, drugstore.com).