Aguilera has not released an album since Lotus
in 2012, but told ET last year that she's working on some new material. "I'm big on the marination process. I have to make sure the details are all there," the former Voice coach explained
. "I really value the creative process and the time it takes. I am working with some incredible new people that, even I'm surprised [to be working with], and then also re-joining with some dear friends of mine."