You've gotta give Demi Lovato credit: the lady does not hold back when it comes to putting her opinion out there! Even when her opinion is that, y'know, there's an entire city of alien mermaids living somewhere in the unexplored depths of the Indian Ocean.

During an appearance on "Late Night with Seth Meyers," Lovato explained that her natural lack of cynicism plus a very convincing documentary from the Discovery Channel equals her complete and total conviction that we're not alone in the universe.

However, she does draw the line somewhere: when Meyers asked Demi if she believed that these mermaids looked anything like their popular depictions in books and movies, she was downright indignant.

"Of course not!" Lovato cried. "They're aliens!"