The magazine reports that the 21-year-old singer plans to focus the next year on her music. Lovato released a new album in March and is headlining her first arena tour beginning in February.
"I think ultimately my main thing is singing," she told People last month. "Maybe movies once in a while, if the right role comes along."
Lovato judged the past two seasons of the Fox singing competition series. Season 3's finale is Thursday at 8/7c.
Fox had no comment.