probably jessie j because i think shes even less relevant than demi. yet for some reason because she hit in the uk for a second we in the us are supposed to care? she brought absolutely nothing to the table in terms of sound or image. demi is just as useless but i mean, she had a tv show right? so some kids grew up with her on tv. so theres at least some semblance of a reason that shes out there hawking records.
Demi takes the cake. Jessie J seemed authentic when she debut and was pretty likable, but then changed her tune from being openly bisexual to "It was just a phase" which angered many of her fans and alienated her core fanbase. I still like her though I think she's very talented but she just seems to have lost herself right now.
Demi on the other hand, she just seems to purposely try to be annoying, she just needs to stay off social media and use the method of not saying anything at all rather than spilling all her thoughts online.