In an interview with Billboard, the singer, who was a coach on NBC's vocal competition show for five intermittent seasons from 2011 to 2016, had nothing positive to say about her former employer, calling the show a "churning hamster wheel" and an "energy sucker" that left her "longing for freedom."
The most telling quote is as follows:
Mark Burnett just deleted her number.
It's perhaps telling that in Aguilera's final season, she mentored winner Alisan Porter, a former child star and recovering alcoholic who it has been argued won more for her compelling backstory than her vocal ability (which is very strong, don't get me wrong).
In any case, it doesn't sound like Aguilera has any interest in ever going back, and is instead refocused on her music career, with her first album in six years, Liberation, coming out next month, and her first tour in a decade in the works.
The Voice airs Mondays and Tuesdays at 8/7c on NBC.