On Monday's episode of The Voice it was the judges, not the contestants, who stole the show with their makeovers.

Adam Levine's showed off his shaved head, Cee-Lo donned a bizarre curly wig with an Elvis-inspired red lace-up jumpsuit and Christina Aguilera shocked fans with her conservative (for her) appearance.

After wearing a plunging black dress that revealed everything but her nipples and a wacky "compact-disc hat" during the battle rounds, the 31-year-old singer opted for a flattering long-sleeve zebra-print look. She also went with a a softer hairstyle, but kept her dramatic makeup, rocking glossy red lips and heavy smoky eyes.

PHOTOS: Christina Aguilera's sexy style moments

Perhaps Aguilera's new demure look influenced her opinion of 17-year-old RaeLynn's hip-shaking dance moves.

"Are you allowed to grind your hips like that at that age?" she asked the young country singer following her sexy performance.