All Time Low's female singer..who do you think it will be?

Cadee Pope PLEASEEE! I'd love that more than life! Sierra would be pretty ******* amazing as well. I don't think it would be Juliet since she's in Remembering Sunday. I really don't think it's Demi since she's already done one with WTK. Hayley's voice just doesn't suit their music. LIGHTS doesn't really fit their vibe either. Maybe Taylor but my fingers are crossed for Cadee (: Ah I want January to come right now :( !