The Alien says her family name is famous, and that we may think she's "out of fashion." She also declares that "no one will ever control" her again, and that this is "the first time, the world gets to hear my voice on my terms." Later, she says she has "many sisters."
So, who could it be? Her performance of "Feel It Still" seems like a pretty good match for Latoya Jackson (seriously — just listen!). It would also make sense given her comments about having a famous family, and control issues (it could be a nod to her father and husband, as well as Janet Jackson's album, Control).