Demi Lovato doesn't hold back when someone's done her wrong, even if it's an old BFF.
Demi's fans noticed that something happened between Demi and her former BFF Marissa Callahan, when she and her sisters unfollowed her on Instagram.
Not long after, Demi went on a lengthy rant.
Apparently this was Demi's response to Marissa shading her on Facebook, for not coming to her birthday party.
Ohhhh the drama.
It's not confirmed that the rant is about Marissa at all, but it does confirm that Demi has fallen out with an old friend.