X-Tina & Demi Lovato Are Dropping a Duet Tomorrow

Christina Aguilera has announced she'll release the third single off of her new album Liberation tomorrow. So far, she's released "Accelerate," featuring Ty Dolla $ign and 2 Chainz, as well as the stripped down "Twice."

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The new song is called "Fall In Line" and features Demi Lovato--both songstresses teased lyrics alongside photos of themselves as children this morning: "Little girls, listen closely. 'Cause no one told me, but you deserve to know that in this world you are not beholden. You do not owe them your body and your soul."

We won't have to wait long to see the song performed live: the two women will debut it onstage this weekend at the Billboard Music Awards.

In a recent interview with Billboard, Aguilera explained how she chose Lovato to join her on the track: ""We went through a few names of women. I needed a belty singer, and she took it to the next level. I almost cried when I first heard her on the record."