Turns out, the answer is maybe.
In a new interview with E! News, Nick teased, "We will see...got to keep some secrets."
So that sounds like concertgoers may be in for a treat (and we promise to post the YouTube videos if they hit the stage together).
Demi also spoke more about BFF Selena Gomez's recent rehab stint, telling E!, "I've known her for 14 years and we've been best friends, but that's all of her business, and I just want to let her do her thing."
Meanwhile, Demi told Extra, "Selena and I have such an amazing friendship...I love her to death."
Hmm...that's got us thinking that maybe Sel will pop up at some of Demi's shows and join her on stage...
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