Christina Aguilera & Justin Bieber? Xtina Is Interested In A Duet

Justin Bieber may soon be leaving his duet partner Nicki Minaj behind -- at least if Christina Aguilera has her way.

The singer and "The Voice" judge told Extra TV she is a big fan of the Biebs and is currently stuck on one song in his growing catalog of chart hits.

"I'm really into this song right now called, 'As Long as You Love Me' and it's Justin Bieber's song, so I'm actually looking forward to it," she said.

When asked if a collaboration is in the stars' futures, Aguilera said she is open to collaborating with Bieber and that "the possibilities are endless, so we'll see."

Both artists performed during Sunday's American Music Awards. Bieber hit the stage with Minaj for "Beauty and the Beat" while Aguilera performed several tracks from her new album, "Lotus."

Aguilera has faced a great deal of criticism recently for her fuller figure, talk that was reignited after she rocked a curve hugging gown on the red carpet and a pantless look -- complete with an embellished corset -- for her AMAs performance.

She has continued to challenge her weight critics, and fellow "The Voice" judge Adam Levine also came to her defense during a visit to "Ellen."

"It's a very basic thing. She should be left alone," said Levine. "No one should bother or hassle her about her weight or anything that she does or says. So, that's it. That's how I feel about it."

Bieber won three awards during the AMAs, including the honor for Artist of the Year.