Demi Lovato just never stops. The "Really Don't Care" singer is on the brink of a worldwide DEMI Tour and is the new face of the Human Rights Campaign's Americans for Marriage Equality, but she's still finding time to hit the recording studio. But, Lovato is not alone.

Yesterday (July 13), Lovato teased a secretive project on her official Twitter and Instagram and it's a "killer duet."

"Recorded a KILLER duet today.... Can you guess who it was with???" she posted on her various social media outlets alongside a photo of two thumbs giving an up-sign in front of a keyboard and soundboard.

Check out the photograph from Lovato's Instagram below the jump:

In true Lovato style, the pop star hasn't revealed the identity of her thumb-y companion quite yet. The crimson red talon is clearly hers, but the mysterious manly digit extending from a grey suit remains a semi-mystery.

Or, as MTV points out, it's probably not so secretive and the other singer is none other than former Jonas Brother/longtime Lovato collaborator Nick Jonas.

As one eagle-eyed Lovatic on Twitter pointed out, the light grey suit seen in the very bottom left corner of the image looks eerily similar to the outfit Jonas rocked on July 13, and the little thumb looks a lot like the youngest JoBro's finger, too.

And these are the exact kind of things rabid fans would take note of...

A collaboration between Lovato and Jonas would be no real surprise to fans of either musician. Earlier this summer, Lovato admitted the two had written an "amazing" song together and the two are longtime friends. This wouldn't even be the first time recently they've joined forces - Jonas was the creative director for Lovato's Neon Lights Tour earlier this year.

The new song from Lovato and probably Jonas is forthcoming, though it has yet to be confirmed when and how it will reach listeners' ears.

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