"She's such like, you know, a force in a room," gushed Aguilera. "She's got that star charisma and everything about her. I couldn't take me eyes off her either—so, it was mutual."
"Is that bad?" the singer wondered. "I don't know maybe I shouldn't say that. I'm so inappropriate."
Speaking of pushing the envelope, Aguilera also talked about her new album, Lotus, the cover of which she notably posed nude for.
"I like to be free," she said. "Sometimes, the less clothing the better. I'm just comfortable in my skin and my body.
"Had I had this beautiful sweater...I would have worn that on the cover of Lotus," she added, motioning to the holly-jolly Christmas sweater Ellen gave her.
Oh, and according to Aguilera, she waves those signature fans around on The Voice for a reason.
"It's our third season in and us as coaches have hit our stride," Aguilera, who has no team members left in the competition this season, explained why she seemed more relaxed these days. "We get what it's all about. We're invested in our teams and I'm sitting next to [Blake Shelton] the whole time, so how can I not laugh?
"Between him and [CeeLo Green], with his gas over there. Then there's [Adam Levine] over there, very competitive."
"That's why I have the fan, you know," Aguilera cracked.