Music News Demi Lovato joins Christina Aguilera for duet, 'Fall in Line' 05/17/2018 Christina Aguilera has joined forces with Demi Lovato for a duet about being outspoken titled "Fall in Line." Read More RELATED NEWS Kaitlyn Bristowe calls Jason Tartick out for being "mean and pathetic"Jimmy Fallon's 'The Tonight Show' dropping to only four nights a weekAshley Tisdale announces birth of her second child TAGS: Christina Aguilera Demi Lovato
