Turns out, it's not...but Demi had a little more to add to the conversation than just shooting down the rumor.
When asked if "Cool For the Summer" is about Ruby Rose, she said, "No, it's not," admitting that she has met the actress but denied she had a relationship her.
When asked if they hooked up, however, Demi talked more about the general interest in her personal life, explaining: "I don't feel like any of my past or future - when it comes to relationships that may have happened or not have happened - are of any concern to anybody. What matters to me is my relationship with Wilmer. We are in an amazing place. Rumors are rumors, and people are going to spread them. You can believe what you want, but no, I was not in a relationship with her."
Demi also revealed that there are "a lot of relationships that I've had where nobody has even guessed it," adding, "Not everybody knows everything about me. The only thing that matters to me is that people know who I am today. With Wilmer, I'm the happiest that I've ever been, so that's all that matters to me."
We're sooo happy that Demi's happy!
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Gallery | Demi Lovato Through the Years