This year, the singer's costume was a tad more ambiguous, but nonetheless festive. The "Voice" coach sported a voluminous pink wig and white crown, while Rutler was her knight in shining armor.
Speaking of chivalry, Aguilera's "Voice" co-star Adam Levine came to her defense this weekend at a press conference, blasting those who have criticized Aguilera for her weight.
"The one thing about the culture right now, celebrity culture particularly, is people feel like they can just say nasty things about other people whether it's Christina or whether it's me," he said, according to People. "She gets a lot and it pisses me off. Of course I have her back and of course I defend her."
In past years, the 31-year-old singer has dressed up as a sexy nurse, a corpse bride, Marie Antoinette, a skeleton and a pirate. But when Aguilera hosted a spooky party at her home in Beverly Hills Oct. 27, the Voice mentor's sexy, skin-baring costume was more ambiguous.
Wearing a white crown and rocking giant pink curls, Aguilera showed off her supple cleavage in a tight black ensemble. She completed her look with pearls, fishnet stockings and knee-high black boots. The "Your Body" singer's boyfriend, Matthew Rutler, suited up as her knight in shining armor.
Aguilera is currently gearing up for the release of her seventh studio album, Lotus, in stores Nov. 9. "I can't wait for my fans to hear this album," Aguilera tells Us Weekly. "There are a few tracks that I know people are going to really connect to. . . Many of my past albums had clear cut themes and styles, but with this album, I really just put songs on the record that felt good."