Demi Lovato Teases 'Killer Duet,' And It's Pretty Obvious Who It's With

And the 'Really Don't Care' singer's duet partner is...

Demi Lovato really brought the mystery on Sunday (July 13) when she Instagrammed a close-up photo of her and a stranger giving a thumbs-up inside a recording studio, captioning: "Recorded a KILLER duet today.... Can you guess who it was with???"

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What the "Really Don't Care" singer didn't expect is that I've read my fair share of devastatingly complex, intricately woven detective novels (like "Sea Serpents Don't Juggle Water Balloons" and "The Boxcar Children: The Mystery Of The Purple Pool" to name a few), so this mystery hardly stood a chance. After much deliberation, I believe that the identity of Demi's "KILLER duet" partner is... Nick Jonas!

Why? Well, first of all, the two have been working very closely this past year. The former member of the Jonas Brothers served as the creative and musical director of his former "Camp Rock" co-star's Neon Lights Tour. Plus, as one eagle-eyed Twitter user pointed out, Nick was wearing an eerily similar gray suit and white shirt ensemble the day that Demi's Instagram was posted.

The final nail in this mystery's coffin? Back in June, Ms. Demetria D. told MTV News: "I did write an amazing song with Nick Jonas, and we want to do something with that but we're not quite sure. So, maybe we can do a side project together. We may or may not have picked out the band name already."

My highly trained powers of deduction tell me that their band name will be... Awesome Friends And Musical Forever Band Hi. Or maybe Demi & Nick. Probably some third option. Another mystery solved!

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